diff --git a/lib/shared/thread-utils.js b/lib/shared/thread-utils.js
--- a/lib/shared/thread-utils.js
+++ b/lib/shared/thread-utils.js
@@ -1524,7 +1524,7 @@
 function getThreadListSearchResults(
   chatListData: $ReadOnlyArray<ChatThreadItem>,
   searchText: string,
-  threadFilter: (LegacyThreadInfo | ThreadInfo) => boolean,
+  threadFilter: ThreadInfo => boolean,
   threadSearchResults: $ReadOnlySet<string>,
   usersSearchResults: $ReadOnlyArray<GlobalAccountUserInfo>,
   loggedInUserInfo: ?LoggedInUserInfo,
diff --git a/native/avatars/edit-thread-avatar.react.js b/native/avatars/edit-thread-avatar.react.js
--- a/native/avatars/edit-thread-avatar.react.js
+++ b/native/avatars/edit-thread-avatar.react.js
@@ -10,7 +10,6 @@
   ThreadInfo,
   RawThreadInfo,
 } from 'lib/types/minimally-encoded-thread-permissions-types.js';
-import type { LegacyThreadInfo } from 'lib/types/thread-types.js';
 
 import {
   useNativeSetThreadAvatar,
@@ -26,7 +25,7 @@
 import { useStyles } from '../themes/colors.js';
 
 type Props = {
-  +threadInfo: RawThreadInfo | LegacyThreadInfo | ThreadInfo,
+  +threadInfo: RawThreadInfo | ThreadInfo,
   +disabled?: boolean,
 };
 function EditThreadAvatar(props: Props): React.Node {
diff --git a/native/avatars/thread-avatar.react.js b/native/avatars/thread-avatar.react.js
--- a/native/avatars/thread-avatar.react.js
+++ b/native/avatars/thread-avatar.react.js
@@ -14,17 +14,12 @@
   RawThreadInfo,
 } from 'lib/types/minimally-encoded-thread-permissions-types.js';
 import { threadTypes } from 'lib/types/thread-types-enum.js';
-import type { LegacyThreadInfo } from 'lib/types/thread-types.js';
 
 import Avatar from './avatar.react.js';
 import { useSelector } from '../redux/redux-utils.js';
 
 type Props = {
-  +threadInfo:
-    | RawThreadInfo
-    | LegacyThreadInfo
-    | ThreadInfo
-    | ResolvedThreadInfo,
+  +threadInfo: RawThreadInfo | ThreadInfo | ResolvedThreadInfo,
   +size: AvatarSize,
 };
 
diff --git a/native/chat/chat-thread-list.react.js b/native/chat/chat-thread-list.react.js
--- a/native/chat/chat-thread-list.react.js
+++ b/native/chat/chat-thread-list.react.js
@@ -33,7 +33,6 @@
 } from 'lib/shared/thread-utils.js';
 import type { ThreadInfo } from 'lib/types/minimally-encoded-thread-permissions-types.js';
 import { threadTypes } from 'lib/types/thread-types-enum.js';
-import type { LegacyThreadInfo } from 'lib/types/thread-types.js';
 import type { UserInfo } from 'lib/types/user-types.js';
 
 import { ChatThreadListItem } from './chat-thread-list-item.react.js';
@@ -77,7 +76,7 @@
   +route:
     | NavigationRoute<'HomeChatThreadList'>
     | NavigationRoute<'BackgroundChatThreadList'>,
-  +filterThreads: (threadItem: LegacyThreadInfo | ThreadInfo) => boolean,
+  +filterThreads: (threadItem: ThreadInfo) => boolean,
   +emptyItem?: React.ComponentType<{}>,
 };
 export type SearchStatus = 'inactive' | 'activating' | 'active';
@@ -127,8 +126,7 @@
   );
 
   const onSwipeableWillOpen = React.useCallback(
-    (threadInfo: LegacyThreadInfo | ThreadInfo) =>
-      setOpenedSwipeableID(threadInfo.id),
+    (threadInfo: ThreadInfo) => setOpenedSwipeableID(threadInfo.id),
     [],
   );
 
@@ -188,7 +186,7 @@
   );
 
   const onPressSeeMoreSidebars = React.useCallback(
-    (threadInfo: LegacyThreadInfo | ThreadInfo) => {
+    (threadInfo: ThreadInfo) => {
       onChangeSearchText('');
       if (searchInputRef.current) {
         searchInputRef.current.blur();
diff --git a/native/chat/fullscreen-thread-media-gallery.react.js b/native/chat/fullscreen-thread-media-gallery.react.js
--- a/native/chat/fullscreen-thread-media-gallery.react.js
+++ b/native/chat/fullscreen-thread-media-gallery.react.js
@@ -4,7 +4,6 @@
 import { Text, TouchableOpacity, View } from 'react-native';
 
 import type { ThreadInfo } from 'lib/types/minimally-encoded-thread-permissions-types.js';
-import type { LegacyThreadInfo } from 'lib/types/thread-types.js';
 
 import type { ChatNavigationProp } from './chat.react.js';
 import ThreadSettingsMediaGallery from './settings/thread-settings-media-gallery.react.js';
@@ -13,7 +12,7 @@
 import type { VerticalBounds } from '../types/layout-types.js';
 
 export type FullScreenThreadMediaGalleryParams = {
-  +threadInfo: LegacyThreadInfo | ThreadInfo,
+  +threadInfo: ThreadInfo,
 };
 
 const Tabs = {
diff --git a/native/chat/inline-engagement.react.js b/native/chat/inline-engagement.react.js
--- a/native/chat/inline-engagement.react.js
+++ b/native/chat/inline-engagement.react.js
@@ -14,7 +14,6 @@
 import { useNextLocalID } from 'lib/shared/message-utils.js';
 import type { MessageInfo } from 'lib/types/message-types.js';
 import type { ThreadInfo } from 'lib/types/minimally-encoded-thread-permissions-types.js';
-import type { LegacyThreadInfo } from 'lib/types/thread-types.js';
 
 import {
   avatarOffset,
@@ -33,7 +32,7 @@
 import type { ChatMessageInfoItemWithHeight } from '../types/chat-types.js';
 
 function dummyNodeForInlineEngagementHeightMeasurement(
-  sidebarInfo: ?LegacyThreadInfo | ?ThreadInfo,
+  sidebarInfo: ?ThreadInfo,
   reactions: ReactionInfo,
 ): React.Element<typeof View> {
   return (
@@ -49,7 +48,7 @@
 type DummyInlineEngagementNodeProps = {
   ...React.ElementConfig<typeof View>,
   +editedLabel?: ?string,
-  +sidebarInfo: ?LegacyThreadInfo | ?ThreadInfo,
+  +sidebarInfo: ?ThreadInfo,
   +reactions: ReactionInfo,
 };
 function DummyInlineEngagementNode(
diff --git a/native/chat/inner-robotext-message.react.js b/native/chat/inner-robotext-message.react.js
--- a/native/chat/inner-robotext-message.react.js
+++ b/native/chat/inner-robotext-message.react.js
@@ -7,7 +7,6 @@
 import type { ReactionInfo } from 'lib/selectors/chat-selectors.js';
 import { threadInfoSelector } from 'lib/selectors/thread-selectors.js';
 import type { ThreadInfo } from 'lib/types/minimally-encoded-thread-permissions-types.js';
-import type { LegacyThreadInfo } from 'lib/types/thread-types.js';
 import {
   type EntityText,
   entityTextToRawString,
@@ -27,7 +26,7 @@
 function dummyNodeForRobotextMessageHeightMeasurement(
   robotext: EntityText,
   threadID: string,
-  sidebarInfo: ?LegacyThreadInfo | ?ThreadInfo,
+  sidebarInfo: ?ThreadInfo,
   reactions: ReactionInfo,
 ): React.Element<typeof View> {
   return (
diff --git a/native/chat/inner-text-message.react.js b/native/chat/inner-text-message.react.js
--- a/native/chat/inner-text-message.react.js
+++ b/native/chat/inner-text-message.react.js
@@ -7,7 +7,6 @@
 import type { ReactionInfo } from 'lib/selectors/chat-selectors.js';
 import { colorIsDark } from 'lib/shared/color-utils.js';
 import type { ThreadInfo } from 'lib/types/minimally-encoded-thread-permissions-types.js';
-import type { LegacyThreadInfo } from 'lib/types/thread-types.js';
 
 import { useComposedMessageMaxWidth } from './composed-message-width.js';
 import { DummyInlineEngagementNode } from './inline-engagement.react.js';
@@ -32,7 +31,7 @@
 function dummyNodeForTextMessageHeightMeasurement(
   text: string,
   editedLabel?: ?string,
-  sidebarInfo: ?LegacyThreadInfo | ?ThreadInfo,
+  sidebarInfo: ?ThreadInfo,
   reactions: ReactionInfo,
 ): React.Element<typeof View> {
   return (
diff --git a/native/chat/message-list.react.js b/native/chat/message-list.react.js
--- a/native/chat/message-list.react.js
+++ b/native/chat/message-list.react.js
@@ -21,7 +21,6 @@
 import type { FetchMessageInfosPayload } from 'lib/types/message-types.js';
 import type { ThreadInfo } from 'lib/types/minimally-encoded-thread-permissions-types.js';
 import { threadTypes } from 'lib/types/thread-types-enum.js';
-import type { LegacyThreadInfo } from 'lib/types/thread-types.js';
 import {
   type DispatchActionPromise,
   useDispatchActionPromise,
@@ -69,7 +68,7 @@
 };
 
 type BaseProps = {
-  +threadInfo: LegacyThreadInfo | ThreadInfo,
+  +threadInfo: ThreadInfo,
   +messageListData: $ReadOnlyArray<ChatMessageItemWithHeight>,
   +navigation: ChatNavigationProp<'MessageList'>,
   +route: NavigationRoute<'MessageList'>,
diff --git a/native/chat/message-preview.react.js b/native/chat/message-preview.react.js
--- a/native/chat/message-preview.react.js
+++ b/native/chat/message-preview.react.js
@@ -8,7 +8,6 @@
 import { useMessagePreview } from 'lib/shared/message-utils.js';
 import { type MessageInfo } from 'lib/types/message-types.js';
 import type { ThreadInfo } from 'lib/types/minimally-encoded-thread-permissions-types.js';
-import type { LegacyThreadInfo } from 'lib/types/thread-types.js';
 
 import SingleLine from '../components/single-line.react.js';
 import { getDefaultTextMessageRules } from '../markdown/rules.react.js';
@@ -16,7 +15,7 @@
 
 type Props = {
   +messageInfo: MessageInfo,
-  +threadInfo: LegacyThreadInfo | ThreadInfo,
+  +threadInfo: ThreadInfo,
 };
 function MessagePreview(props: Props): React.Node {
   const { messageInfo, threadInfo } = props;
diff --git a/native/chat/relationship-prompt.react.js b/native/chat/relationship-prompt.react.js
--- a/native/chat/relationship-prompt.react.js
+++ b/native/chat/relationship-prompt.react.js
@@ -7,7 +7,6 @@
 import { useRelationshipPrompt } from 'lib/hooks/relationship-prompt.js';
 import type { ThreadInfo } from 'lib/types/minimally-encoded-thread-permissions-types.js';
 import { userRelationshipStatus } from 'lib/types/relationship-types.js';
-import type { LegacyThreadInfo } from 'lib/types/thread-types.js';
 import type { UserInfo } from 'lib/types/user-types.js';
 
 import Button from '../components/button.react.js';
@@ -16,7 +15,7 @@
 
 type Props = {
   +pendingPersonalThreadUserInfo: ?UserInfo,
-  +threadInfo: LegacyThreadInfo | ThreadInfo,
+  +threadInfo: ThreadInfo,
 };
 
 const RelationshipPrompt: React.ComponentType<Props> = React.memo<Props>(
diff --git a/native/chat/settings/add-users-modal.react.js b/native/chat/settings/add-users-modal.react.js
--- a/native/chat/settings/add-users-modal.react.js
+++ b/native/chat/settings/add-users-modal.react.js
@@ -14,7 +14,6 @@
 import { usePotentialMemberItems } from 'lib/shared/search-utils.js';
 import { threadActualMembers } from 'lib/shared/thread-utils.js';
 import type { ThreadInfo } from 'lib/types/minimally-encoded-thread-permissions-types.js';
-import type { LegacyThreadInfo } from 'lib/types/thread-types.js';
 import { type AccountUserInfo } from 'lib/types/user-types.js';
 import { useDispatchActionPromise } from 'lib/utils/redux-promise-utils.js';
 
@@ -43,7 +42,7 @@
 
 export type AddUsersModalParams = {
   +presentedFrom: string,
-  +threadInfo: LegacyThreadInfo | ThreadInfo,
+  +threadInfo: ThreadInfo,
 };
 
 type Props = {
diff --git a/native/chat/settings/color-selector-modal.react.js b/native/chat/settings/color-selector-modal.react.js
--- a/native/chat/settings/color-selector-modal.react.js
+++ b/native/chat/settings/color-selector-modal.react.js
@@ -12,7 +12,6 @@
 import {
   type ChangeThreadSettingsPayload,
   type UpdateThreadRequest,
-  type LegacyThreadInfo,
 } from 'lib/types/thread-types.js';
 import {
   type DispatchActionPromise,
@@ -30,7 +29,7 @@
 export type ColorSelectorModalParams = {
   +presentedFrom: string,
   +color: string,
-  +threadInfo: LegacyThreadInfo | ThreadInfo,
+  +threadInfo: ThreadInfo,
   +setColor: (color: string) => void,
 };
 
diff --git a/native/chat/settings/delete-thread.react.js b/native/chat/settings/delete-thread.react.js
--- a/native/chat/settings/delete-thread.react.js
+++ b/native/chat/settings/delete-thread.react.js
@@ -29,10 +29,7 @@
   ResolvedThreadInfo,
   ThreadInfo,
 } from 'lib/types/minimally-encoded-thread-permissions-types.js';
-import type {
-  LeaveThreadPayload,
-  LegacyThreadInfo,
-} from 'lib/types/thread-types.js';
+import type { LeaveThreadPayload } from 'lib/types/thread-types.js';
 import { useResolvedThreadInfo } from 'lib/utils/entity-helpers.js';
 import {
   type DispatchActionPromise,
@@ -52,7 +49,7 @@
 import type { ChatNavigationProp } from '../chat.react.js';
 
 export type DeleteThreadParams = {
-  +threadInfo: LegacyThreadInfo | ThreadInfo,
+  +threadInfo: ThreadInfo,
 };
 
 const unboundStyles = {
diff --git a/native/chat/settings/emoji-thread-avatar-creation.react.js b/native/chat/settings/emoji-thread-avatar-creation.react.js
--- a/native/chat/settings/emoji-thread-avatar-creation.react.js
+++ b/native/chat/settings/emoji-thread-avatar-creation.react.js
@@ -10,7 +10,6 @@
   ThreadInfo,
   RawThreadInfo,
 } from 'lib/types/minimally-encoded-thread-permissions-types.js';
-import type { LegacyThreadInfo } from 'lib/types/thread-types.js';
 
 import { useNativeSetThreadAvatar } from '../../avatars/avatar-hooks.js';
 import EmojiAvatarCreation from '../../avatars/emoji-avatar-creation.react.js';
@@ -20,7 +19,7 @@
 import { useSelector } from '../../redux/redux-utils.js';
 
 export type EmojiThreadAvatarCreationParams = {
-  +threadInfo: RawThreadInfo | LegacyThreadInfo | ThreadInfo,
+  +threadInfo: RawThreadInfo | ThreadInfo,
 };
 
 type Props = {
diff --git a/native/chat/settings/thread-settings-color.react.js b/native/chat/settings/thread-settings-color.react.js
--- a/native/chat/settings/thread-settings-color.react.js
+++ b/native/chat/settings/thread-settings-color.react.js
@@ -7,7 +7,6 @@
 import { createLoadingStatusSelector } from 'lib/selectors/loading-selectors.js';
 import type { LoadingStatus } from 'lib/types/loading-types.js';
 import type { ThreadInfo } from 'lib/types/minimally-encoded-thread-permissions-types.js';
-import type { LegacyThreadInfo } from 'lib/types/thread-types.js';
 
 import type { ThreadSettingsNavigate } from './thread-settings.react.js';
 import ColorSplotch from '../../components/color-splotch.react.js';
@@ -39,7 +38,7 @@
 };
 
 type BaseProps = {
-  +threadInfo: LegacyThreadInfo | ThreadInfo,
+  +threadInfo: ThreadInfo,
   +colorEditValue: string,
   +setColorEditValue: (color: string) => void,
   +canChangeSettings: boolean,
diff --git a/native/chat/settings/thread-settings-description.react.js b/native/chat/settings/thread-settings-description.react.js
--- a/native/chat/settings/thread-settings-description.react.js
+++ b/native/chat/settings/thread-settings-description.react.js
@@ -21,7 +21,6 @@
 import {
   type ChangeThreadSettingsPayload,
   type UpdateThreadRequest,
-  type LegacyThreadInfo,
 } from 'lib/types/thread-types.js';
 import {
   type DispatchActionPromise,
@@ -88,7 +87,7 @@
 };
 
 type BaseProps = {
-  +threadInfo: LegacyThreadInfo | ThreadInfo,
+  +threadInfo: ThreadInfo,
   +descriptionEditValue: ?string,
   +setDescriptionEditValue: (value: ?string, callback?: () => void) => void,
   +descriptionTextHeight: ?number,
diff --git a/native/chat/settings/thread-settings-edit-relationship.react.js b/native/chat/settings/thread-settings-edit-relationship.react.js
--- a/native/chat/settings/thread-settings-edit-relationship.react.js
+++ b/native/chat/settings/thread-settings-edit-relationship.react.js
@@ -19,7 +19,6 @@
   type RelationshipAction,
   type RelationshipButton,
 } from 'lib/types/relationship-types.js';
-import type { LegacyThreadInfo } from 'lib/types/thread-types.js';
 import { useLegacyAshoatKeyserverCall } from 'lib/utils/action-utils.js';
 import { useDispatchActionPromise } from 'lib/utils/redux-promise-utils.js';
 
@@ -30,7 +29,7 @@
 import Alert from '../../utils/alert.js';
 
 type Props = {
-  +threadInfo: LegacyThreadInfo | ThreadInfo,
+  +threadInfo: ThreadInfo,
   +buttonStyle: ViewStyle,
   +relationshipButton: RelationshipButton,
 };
diff --git a/native/chat/settings/thread-settings-home-notifs.react.js b/native/chat/settings/thread-settings-home-notifs.react.js
--- a/native/chat/settings/thread-settings-home-notifs.react.js
+++ b/native/chat/settings/thread-settings-home-notifs.react.js
@@ -12,7 +12,6 @@
   SubscriptionUpdateRequest,
   SubscriptionUpdateResult,
 } from 'lib/types/subscription-types.js';
-import type { LegacyThreadInfo } from 'lib/types/thread-types.js';
 import {
   type DispatchActionPromise,
   useDispatchActionPromise,
@@ -44,7 +43,7 @@
 };
 
 type BaseProps = {
-  +threadInfo: LegacyThreadInfo | ThreadInfo,
+  +threadInfo: ThreadInfo,
 };
 type Props = {
   ...BaseProps,
diff --git a/native/chat/settings/thread-settings-leave-thread.react.js b/native/chat/settings/thread-settings-leave-thread.react.js
--- a/native/chat/settings/thread-settings-leave-thread.react.js
+++ b/native/chat/settings/thread-settings-leave-thread.react.js
@@ -14,10 +14,7 @@
 import { identifyInvalidatedThreads } from 'lib/shared/thread-utils.js';
 import type { LoadingStatus } from 'lib/types/loading-types.js';
 import type { ThreadInfo } from 'lib/types/minimally-encoded-thread-permissions-types.js';
-import type {
-  LeaveThreadPayload,
-  LegacyThreadInfo,
-} from 'lib/types/thread-types.js';
+import type { LeaveThreadPayload } from 'lib/types/thread-types.js';
 import {
   type DispatchActionPromise,
   useDispatchActionPromise,
@@ -52,7 +49,7 @@
 };
 
 type BaseProps = {
-  +threadInfo: LegacyThreadInfo | ThreadInfo,
+  +threadInfo: ThreadInfo,
   +buttonStyle: ViewStyle,
 };
 type Props = {
diff --git a/native/chat/settings/thread-settings-member-tooltip-modal.react.js b/native/chat/settings/thread-settings-member-tooltip-modal.react.js
--- a/native/chat/settings/thread-settings-member-tooltip-modal.react.js
+++ b/native/chat/settings/thread-settings-member-tooltip-modal.react.js
@@ -6,10 +6,7 @@
 import { removeMemberFromThread } from 'lib/shared/thread-utils.js';
 import { stringForUser } from 'lib/shared/user-utils.js';
 import type { ThreadInfo } from 'lib/types/minimally-encoded-thread-permissions-types.js';
-import type {
-  LegacyThreadInfo,
-  RelativeMemberInfo,
-} from 'lib/types/thread-types.js';
+import type { RelativeMemberInfo } from 'lib/types/thread-types.js';
 import { useDispatchActionPromise } from 'lib/utils/redux-promise-utils.js';
 
 import ThreadSettingsMemberTooltipButton from './thread-settings-member-tooltip-button.react.js';
@@ -26,7 +23,7 @@
 
 export type ThreadSettingsMemberTooltipModalParams = TooltipParams<{
   +memberInfo: RelativeMemberInfo,
-  +threadInfo: LegacyThreadInfo | ThreadInfo,
+  +threadInfo: ThreadInfo,
 }>;
 
 function useOnRemoveUser(
diff --git a/native/chat/settings/thread-settings-member.react.js b/native/chat/settings/thread-settings-member.react.js
--- a/native/chat/settings/thread-settings-member.react.js
+++ b/native/chat/settings/thread-settings-member.react.js
@@ -20,10 +20,7 @@
 import { stringForUser } from 'lib/shared/user-utils.js';
 import type { LoadingStatus } from 'lib/types/loading-types.js';
 import type { ThreadInfo } from 'lib/types/minimally-encoded-thread-permissions-types.js';
-import type {
-  LegacyThreadInfo,
-  RelativeMemberInfo,
-} from 'lib/types/thread-types.js';
+import type { RelativeMemberInfo } from 'lib/types/thread-types.js';
 import { useRolesFromCommunityThreadInfo } from 'lib/utils/role-utils.js';
 
 import type { ThreadSettingsNavigate } from './thread-settings.react.js';
@@ -91,7 +88,7 @@
 
 type BaseProps = {
   +memberInfo: RelativeMemberInfo,
-  +threadInfo: LegacyThreadInfo | ThreadInfo,
+  +threadInfo: ThreadInfo,
   +canEdit: boolean,
   +navigate: ThreadSettingsNavigate,
   +firstListItem: boolean,
diff --git a/native/chat/settings/thread-settings-promote-sidebar.react.js b/native/chat/settings/thread-settings-promote-sidebar.react.js
--- a/native/chat/settings/thread-settings-promote-sidebar.react.js
+++ b/native/chat/settings/thread-settings-promote-sidebar.react.js
@@ -6,7 +6,6 @@
 import { usePromoteSidebar } from 'lib/hooks/promote-sidebar.react.js';
 import type { LoadingStatus } from 'lib/types/loading-types.js';
 import type { ThreadInfo } from 'lib/types/minimally-encoded-thread-permissions-types.js';
-import type { LegacyThreadInfo } from 'lib/types/thread-types.js';
 
 import Button from '../../components/button.react.js';
 import { type Colors, useColors, useStyles } from '../../themes/colors.js';
@@ -31,7 +30,7 @@
 };
 
 type BaseProps = {
-  +threadInfo: LegacyThreadInfo | ThreadInfo,
+  +threadInfo: ThreadInfo,
   +buttonStyle: ViewStyle,
 };
 type Props = {
diff --git a/native/chat/settings/thread-settings-push-notifs.react.js b/native/chat/settings/thread-settings-push-notifs.react.js
--- a/native/chat/settings/thread-settings-push-notifs.react.js
+++ b/native/chat/settings/thread-settings-push-notifs.react.js
@@ -15,7 +15,6 @@
   SubscriptionUpdateRequest,
   SubscriptionUpdateResult,
 } from 'lib/types/subscription-types.js';
-import type { LegacyThreadInfo } from 'lib/types/thread-types.js';
 import {
   type DispatchActionPromise,
   useDispatchActionPromise,
@@ -54,7 +53,7 @@
 };
 
 type BaseProps = {
-  +threadInfo: LegacyThreadInfo | ThreadInfo,
+  +threadInfo: ThreadInfo,
 };
 type Props = {
   ...BaseProps,
diff --git a/native/chat/settings/thread-settings-visibility.react.js b/native/chat/settings/thread-settings-visibility.react.js
--- a/native/chat/settings/thread-settings-visibility.react.js
+++ b/native/chat/settings/thread-settings-visibility.react.js
@@ -4,13 +4,12 @@
 import { Text, View } from 'react-native';
 
 import type { ThreadInfo } from 'lib/types/minimally-encoded-thread-permissions-types.js';
-import type { LegacyThreadInfo } from 'lib/types/thread-types.js';
 
 import ThreadVisibility from '../../components/thread-visibility.react.js';
 import { useColors, useStyles } from '../../themes/colors.js';
 
 type Props = {
-  +threadInfo: LegacyThreadInfo | ThreadInfo,
+  +threadInfo: ThreadInfo,
 };
 function ThreadSettingsVisibility(props: Props): React.Node {
   const styles = useStyles(unboundStyles);
diff --git a/native/chat/sidebar-list-modal.react.js b/native/chat/sidebar-list-modal.react.js
--- a/native/chat/sidebar-list-modal.react.js
+++ b/native/chat/sidebar-list-modal.react.js
@@ -5,7 +5,7 @@
 
 import { useSearchSidebars } from 'lib/hooks/search-threads.js';
 import type { ThreadInfo } from 'lib/types/minimally-encoded-thread-permissions-types.js';
-import type { LegacyThreadInfo, SidebarInfo } from 'lib/types/thread-types.js';
+import type { SidebarInfo } from 'lib/types/thread-types.js';
 
 import { SidebarItem } from './sidebar-item.react.js';
 import ThreadListModal from './thread-list-modal.react.js';
@@ -17,7 +17,7 @@
 import Arrow from '../vectors/arrow.react.js';
 
 export type SidebarListModalParams = {
-  +threadInfo: LegacyThreadInfo | ThreadInfo,
+  +threadInfo: ThreadInfo,
 };
 
 type Props = {
@@ -31,7 +31,7 @@
   const numOfSidebarsWithExtendedArrow = listData.length - 1;
 
   const createRenderItem = React.useCallback(
-    (onPressItem: (threadInfo: LegacyThreadInfo | ThreadInfo) => void) =>
+    (onPressItem: (threadInfo: ThreadInfo) => void) =>
       // eslint-disable-next-line react/display-name
       (row: { +item: SidebarInfo, +index: number, ... }) => {
         let extendArrow: boolean = false;
@@ -65,7 +65,7 @@
 
 function Item(props: {
   item: SidebarInfo,
-  onPressItem: (threadInfo: LegacyThreadInfo | ThreadInfo) => void,
+  onPressItem: (threadInfo: ThreadInfo) => void,
   extendArrow: boolean,
 }): React.Node {
   const { item, onPressItem, extendArrow } = props;
diff --git a/native/chat/subchannels-list-modal.react.js b/native/chat/subchannels-list-modal.react.js
--- a/native/chat/subchannels-list-modal.react.js
+++ b/native/chat/subchannels-list-modal.react.js
@@ -6,7 +6,6 @@
 import { useSearchSubchannels } from 'lib/hooks/search-threads.js';
 import type { ChatThreadItem } from 'lib/selectors/chat-selectors.js';
 import type { ThreadInfo } from 'lib/types/minimally-encoded-thread-permissions-types.js';
-import type { LegacyThreadInfo } from 'lib/types/thread-types.js';
 
 import SubchannelItem from './subchannel-item.react.js';
 import ThreadListModal from './thread-list-modal.react.js';
@@ -16,7 +15,7 @@
 import { useColors, useStyles } from '../themes/colors.js';
 
 export type SubchannelListModalParams = {
-  +threadInfo: LegacyThreadInfo | ThreadInfo,
+  +threadInfo: ThreadInfo,
 };
 
 type Props = {
@@ -42,14 +41,14 @@
 }
 
 const createRenderItem =
-  (onPressItem: (threadInfo: LegacyThreadInfo | ThreadInfo) => void) =>
+  (onPressItem: (threadInfo: ThreadInfo) => void) =>
   // eslint-disable-next-line react/display-name
   (row: { +item: ChatThreadItem, +index: number, ... }) => {
     return <Item subchannelInfo={row.item} onPressItem={onPressItem} />;
   };
 
 function Item(props: {
-  onPressItem: (threadInfo: LegacyThreadInfo | ThreadInfo) => void,
+  onPressItem: (threadInfo: ThreadInfo) => void,
   subchannelInfo: ChatThreadItem,
 }): React.Node {
   const { onPressItem, subchannelInfo } = props;
diff --git a/native/components/community-actions-button.react.js b/native/components/community-actions-button.react.js
--- a/native/components/community-actions-button.react.js
+++ b/native/components/community-actions-button.react.js
@@ -10,7 +10,6 @@
 import { threadHasPermission } from 'lib/shared/thread-utils.js';
 import type { ThreadInfo } from 'lib/types/minimally-encoded-thread-permissions-types.js';
 import { threadPermissions } from 'lib/types/thread-permission-types.js';
-import type { LegacyThreadInfo } from 'lib/types/thread-types.js';
 
 import SWMansionIcon from './swmansion-icon.react.js';
 import {
@@ -24,7 +23,7 @@
 import { useStyles } from '../themes/colors.js';
 
 type Props = {
-  +community: LegacyThreadInfo | ThreadInfo,
+  +community: ThreadInfo,
 };
 
 function CommunityActionsButton(props: Props): React.Node {
diff --git a/native/components/thread-ancestors.react.js b/native/components/thread-ancestors.react.js
--- a/native/components/thread-ancestors.react.js
+++ b/native/components/thread-ancestors.react.js
@@ -7,7 +7,6 @@
 
 import { ancestorThreadInfos } from 'lib/selectors/thread-selectors.js';
 import type { ThreadInfo } from 'lib/types/minimally-encoded-thread-permissions-types.js';
-import type { LegacyThreadInfo } from 'lib/types/thread-types.js';
 
 import Button from './button.react.js';
 import CommunityPill from './community-pill.react.js';
@@ -17,7 +16,7 @@
 import { useColors, useStyles } from '../themes/colors.js';
 
 type Props = {
-  +threadInfo: LegacyThreadInfo | ThreadInfo,
+  +threadInfo: ThreadInfo,
 };
 
 function ThreadAncestors(props: Props): React.Node {
diff --git a/native/invite-links/manage-public-link-screen.react.js b/native/invite-links/manage-public-link-screen.react.js
--- a/native/invite-links/manage-public-link-screen.react.js
+++ b/native/invite-links/manage-public-link-screen.react.js
@@ -11,7 +11,6 @@
   inviteLinkErrorMessages,
 } from 'lib/shared/invite-links.js';
 import type { ThreadInfo } from 'lib/types/minimally-encoded-thread-permissions-types.js';
-import type { LegacyThreadInfo } from 'lib/types/thread-types.js';
 
 import Button from '../components/button.react.js';
 import TextInput from '../components/text-input.react.js';
@@ -22,7 +21,7 @@
 import Alert from '../utils/alert.js';
 
 export type ManagePublicLinkScreenParams = {
-  +community: LegacyThreadInfo | ThreadInfo,
+  +community: ThreadInfo,
 };
 
 type Props = {
diff --git a/native/invite-links/view-invite-links-screen.react.js b/native/invite-links/view-invite-links-screen.react.js
--- a/native/invite-links/view-invite-links-screen.react.js
+++ b/native/invite-links/view-invite-links-screen.react.js
@@ -11,7 +11,6 @@
 import type { InviteLink } from 'lib/types/link-types.js';
 import type { ThreadInfo } from 'lib/types/minimally-encoded-thread-permissions-types.js';
 import { threadPermissions } from 'lib/types/thread-permission-types.js';
-import type { LegacyThreadInfo } from 'lib/types/thread-types.js';
 
 import SingleLine from '../components/single-line.react.js';
 import SWMansionIcon from '../components/swmansion-icon.react.js';
@@ -25,7 +24,7 @@
 import { useColors, useStyles } from '../themes/colors.js';
 
 export type ViewInviteLinksScreenParams = {
-  +community: LegacyThreadInfo | ThreadInfo,
+  +community: ThreadInfo,
 };
 
 type Props = {
diff --git a/native/keyboard/keyboard-state-container.react.js b/native/keyboard/keyboard-state-container.react.js
--- a/native/keyboard/keyboard-state-container.react.js
+++ b/native/keyboard/keyboard-state-container.react.js
@@ -5,7 +5,6 @@
 import { KeyboardUtils } from 'react-native-keyboard-input';
 
 import type { ThreadInfo } from 'lib/types/minimally-encoded-thread-permissions-types.js';
-import type { LegacyThreadInfo } from 'lib/types/thread-types.js';
 import sleep from 'lib/utils/sleep.js';
 
 import KeyboardInputHost from './keyboard-input-host.react.js';
@@ -24,7 +23,7 @@
 type State = {
   +systemKeyboardShowing: boolean,
   +mediaGalleryOpen: boolean,
-  +mediaGalleryThread: ?LegacyThreadInfo | ?ThreadInfo,
+  +mediaGalleryThread: ?ThreadInfo,
   +renderKeyboardInputHost: boolean,
 };
 class KeyboardStateContainer extends React.PureComponent<Props, State> {
@@ -94,9 +93,7 @@
     return systemKeyboardShowing || mediaGalleryOpen;
   }
 
-  showMediaGallery: (thread: LegacyThreadInfo | ThreadInfo) => void = (
-    thread: LegacyThreadInfo | ThreadInfo,
-  ) => {
+  showMediaGallery: (thread: ThreadInfo) => void = (thread: ThreadInfo) => {
     this.setState({
       mediaGalleryOpen: true,
       mediaGalleryThread: thread,
@@ -111,7 +108,7 @@
     });
   };
 
-  getMediaGalleryThread: () => ?LegacyThreadInfo | ?ThreadInfo = () =>
+  getMediaGalleryThread: () => ?ThreadInfo = () =>
     this.state.mediaGalleryThread;
 
   render(): React.Node {
diff --git a/native/keyboard/keyboard-state.js b/native/keyboard/keyboard-state.js
--- a/native/keyboard/keyboard-state.js
+++ b/native/keyboard/keyboard-state.js
@@ -3,7 +3,6 @@
 import * as React from 'react';
 
 import type { ThreadInfo } from 'lib/types/minimally-encoded-thread-permissions-types.js';
-import type { LegacyThreadInfo } from 'lib/types/thread-types.js';
 
 export type KeyboardState = {
   +keyboardShowing: boolean,
@@ -11,9 +10,9 @@
   +dismissKeyboardIfShowing: () => boolean,
   +systemKeyboardShowing: boolean,
   +mediaGalleryOpen: boolean,
-  +showMediaGallery: (thread: LegacyThreadInfo | ThreadInfo) => void,
+  +showMediaGallery: (thread: ThreadInfo) => void,
   +hideMediaGallery: () => void,
-  +getMediaGalleryThread: () => ?LegacyThreadInfo | ?ThreadInfo,
+  +getMediaGalleryThread: () => ?ThreadInfo,
 };
 
 const KeyboardContext: React.Context<?KeyboardState> =
diff --git a/native/markdown/rules.react.js b/native/markdown/rules.react.js
--- a/native/markdown/rules.react.js
+++ b/native/markdown/rules.react.js
@@ -8,10 +8,7 @@
 import * as SharedMarkdown from 'lib/shared/markdown.js';
 import { chatMentionRegex } from 'lib/shared/mention-utils.js';
 import type { ThreadInfo } from 'lib/types/minimally-encoded-thread-permissions-types.js';
-import type {
-  ChatMentionCandidates,
-  LegacyThreadInfo,
-} from 'lib/types/thread-types.js';
+import type { ChatMentionCandidates } from 'lib/types/thread-types.js';
 
 import MarkdownChatMention from './markdown-chat-mention.react.js';
 import MarkdownLink from './markdown-link.react.js';
@@ -349,7 +346,7 @@
 });
 
 function useTextMessageRulesFunc(
-  threadInfo: LegacyThreadInfo | ThreadInfo,
+  threadInfo: ThreadInfo,
   chatMentionCandidates: ChatMentionCandidates,
 ): (useDarkStyle: boolean) => MarkdownRules {
   const { members } = threadInfo;
diff --git a/native/media/media-gallery-keyboard.react.js b/native/media/media-gallery-keyboard.react.js
--- a/native/media/media-gallery-keyboard.react.js
+++ b/native/media/media-gallery-keyboard.react.js
@@ -23,7 +23,6 @@
 import { useIsAppForegrounded } from 'lib/shared/lifecycle-utils.js';
 import type { MediaLibrarySelection } from 'lib/types/media-types.js';
 import type { ThreadInfo } from 'lib/types/minimally-encoded-thread-permissions-types.js';
-import type { LegacyThreadInfo } from 'lib/types/thread-types.js';
 
 import { getCompatibleMediaURI } from './identifier-utils.js';
 import MediaGalleryMedia from './media-gallery-media.react.js';
@@ -103,7 +102,7 @@
 };
 
 type BaseProps = {
-  +threadInfo: ?LegacyThreadInfo | ?ThreadInfo,
+  +threadInfo: ?ThreadInfo,
 };
 type Props = {
   ...BaseProps,
diff --git a/native/navigation/nav-selectors.js b/native/navigation/nav-selectors.js
--- a/native/navigation/nav-selectors.js
+++ b/native/navigation/nav-selectors.js
@@ -17,7 +17,6 @@
 } from 'lib/types/message-types.js';
 import type { ThreadInfo } from 'lib/types/minimally-encoded-thread-permissions-types.js';
 import type { GlobalTheme } from 'lib/types/theme-types.js';
-import type { LegacyThreadInfo } from 'lib/types/thread-types.js';
 
 import type { NavContextType } from './navigation-context.js';
 import { NavContext } from './navigation-context.js';
@@ -404,7 +403,7 @@
 }
 
 function useCanEditMessageNative(
-  threadInfo: LegacyThreadInfo | ThreadInfo,
+  threadInfo: ThreadInfo,
   targetMessageInfo: ComposableMessageInfo | RobotextMessageInfo,
 ): boolean {
   const route = useRoute();
diff --git a/native/navigation/subchannels-button.react.js b/native/navigation/subchannels-button.react.js
--- a/native/navigation/subchannels-button.react.js
+++ b/native/navigation/subchannels-button.react.js
@@ -6,13 +6,12 @@
 import { Text, TouchableOpacity, View } from 'react-native';
 
 import type { ThreadInfo } from 'lib/types/minimally-encoded-thread-permissions-types.js';
-import type { LegacyThreadInfo } from 'lib/types/thread-types.js';
 
 import { SubchannelsListModalRouteName } from './route-names.js';
 import { useStyles } from '../themes/colors.js';
 
 type Props = {
-  +threadInfo: LegacyThreadInfo | ThreadInfo,
+  +threadInfo: ThreadInfo,
 };
 
 function SubchnnelsButton(props: Props): React.Node {
diff --git a/native/roles/change-roles-screen.react.js b/native/roles/change-roles-screen.react.js
--- a/native/roles/change-roles-screen.react.js
+++ b/native/roles/change-roles-screen.react.js
@@ -13,10 +13,7 @@
 import { roleIsAdminRole } from 'lib/shared/thread-utils.js';
 import type { LoadingStatus } from 'lib/types/loading-types.js';
 import type { ThreadInfo } from 'lib/types/minimally-encoded-thread-permissions-types.js';
-import type {
-  LegacyThreadInfo,
-  RelativeMemberInfo,
-} from 'lib/types/thread-types.js';
+import type { RelativeMemberInfo } from 'lib/types/thread-types.js';
 import { values } from 'lib/utils/objects.js';
 
 import ChangeRolesHeaderRightButton from './change-roles-header-right-button.react.js';
@@ -28,7 +25,7 @@
 import { useStyles } from '../themes/colors.js';
 
 export type ChangeRolesScreenParams = {
-  +threadInfo: LegacyThreadInfo | ThreadInfo,
+  +threadInfo: ThreadInfo,
   +memberInfo: RelativeMemberInfo,
   +role: ?string,
 };
diff --git a/native/roles/community-roles-screen.react.js b/native/roles/community-roles-screen.react.js
--- a/native/roles/community-roles-screen.react.js
+++ b/native/roles/community-roles-screen.react.js
@@ -10,7 +10,6 @@
   useRoleUserSurfacedPermissions,
 } from 'lib/shared/thread-utils.js';
 import type { ThreadInfo } from 'lib/types/minimally-encoded-thread-permissions-types.js';
-import type { LegacyThreadInfo } from 'lib/types/thread-types.js';
 
 import RolePanelEntry from './role-panel-entry.react.js';
 import type { RolesNavigationProp } from './roles-navigator.react.js';
@@ -21,7 +20,7 @@
 import { useStyles } from '../themes/colors.js';
 
 export type CommunityRolesScreenParams = {
-  +threadInfo: LegacyThreadInfo | ThreadInfo,
+  +threadInfo: ThreadInfo,
 };
 
 type CommunityRolesScreenProps = {
@@ -38,7 +37,7 @@
   // manually pull in the threadInfo from the redux store, since the threadInfo
   // passed into the route params will not be updated automatically.
   const threadID = threadInfo.id;
-  const reduxThreadInfo: ?LegacyThreadInfo | ?ThreadInfo = useSelector(
+  const reduxThreadInfo: ?ThreadInfo = useSelector(
     state => threadInfoSelector(state)[threadID],
   );
 
diff --git a/native/roles/create-roles-screen.react.js b/native/roles/create-roles-screen.react.js
--- a/native/roles/create-roles-screen.react.js
+++ b/native/roles/create-roles-screen.react.js
@@ -13,7 +13,6 @@
   type UserSurfacedPermissionOption,
   userSurfacedPermissionOptions,
 } from 'lib/types/thread-permission-types.js';
-import type { LegacyThreadInfo } from 'lib/types/thread-types.js';
 
 import CreateRolesHeaderRightButton from './create-roles-header-right-button.react.js';
 import type { RolesNavigationProp } from './roles-navigator.react.js';
@@ -25,7 +24,7 @@
 import { useStyles } from '../themes/colors.js';
 
 export type CreateRolesScreenParams = {
-  +threadInfo: LegacyThreadInfo | ThreadInfo,
+  +threadInfo: ThreadInfo,
   +action: 'create_role' | 'edit_role',
   +existingRoleID?: string,
   +roleName: string,
diff --git a/native/roles/role-panel-entry.react.js b/native/roles/role-panel-entry.react.js
--- a/native/roles/role-panel-entry.react.js
+++ b/native/roles/role-panel-entry.react.js
@@ -8,7 +8,6 @@
 
 import type { ThreadInfo } from 'lib/types/minimally-encoded-thread-permissions-types.js';
 import type { UserSurfacedPermission } from 'lib/types/thread-permission-types.js';
-import type { LegacyThreadInfo } from 'lib/types/thread-types.js';
 
 import { useDisplayDeleteRoleAlert } from './role-utils.react.js';
 import type { RolesNavigationProp } from './roles-navigator.react.js';
@@ -20,7 +19,7 @@
 
 type RolePanelEntryProps = {
   +navigation: RolesNavigationProp<'CommunityRolesScreen'>,
-  +threadInfo: LegacyThreadInfo | ThreadInfo,
+  +threadInfo: ThreadInfo,
   +roleName: string,
   +rolePermissions: $ReadOnlySet<UserSurfacedPermission>,
   +memberCount: number,
diff --git a/native/roles/role-utils.react.js b/native/roles/role-utils.react.js
--- a/native/roles/role-utils.react.js
+++ b/native/roles/role-utils.react.js
@@ -7,14 +7,13 @@
   useDeleteCommunityRole,
 } from 'lib/actions/thread-actions.js';
 import type { ThreadInfo } from 'lib/types/minimally-encoded-thread-permissions-types.js';
-import type { LegacyThreadInfo } from 'lib/types/thread-types.js';
 import { useDispatchActionPromise } from 'lib/utils/redux-promise-utils.js';
 import { constructRoleDeletionMessagePrompt } from 'lib/utils/role-utils.js';
 
 import Alert from '../utils/alert.js';
 
 function useDisplayDeleteRoleAlert(
-  threadInfo: LegacyThreadInfo | ThreadInfo,
+  threadInfo: ThreadInfo,
   existingRoleID: string,
   defaultRoleID: string,
   memberCount: number,
diff --git a/native/user-profile/user-profile-menu-button.react.js b/native/user-profile/user-profile-menu-button.react.js
--- a/native/user-profile/user-profile-menu-button.react.js
+++ b/native/user-profile/user-profile-menu-button.react.js
@@ -8,7 +8,6 @@
 import { useRelationshipPrompt } from 'lib/hooks/relationship-prompt.js';
 import type { ThreadInfo } from 'lib/types/minimally-encoded-thread-permissions-types.js';
 import { userRelationshipStatus } from 'lib/types/relationship-types.js';
-import type { LegacyThreadInfo } from 'lib/types/thread-types.js';
 import type { UserInfo } from 'lib/types/user-types';
 
 import { userProfileMenuButtonHeight } from './user-profile-constants.js';
@@ -22,7 +21,7 @@
 const onMenuButtonLayout = () => {};
 
 type Props = {
-  +threadInfo: LegacyThreadInfo | ThreadInfo,
+  +threadInfo: ThreadInfo,
   +pendingPersonalThreadUserInfo: ?UserInfo,
 };
 
diff --git a/native/user-profile/user-profile-relationship-button.react.js b/native/user-profile/user-profile-relationship-button.react.js
--- a/native/user-profile/user-profile-relationship-button.react.js
+++ b/native/user-profile/user-profile-relationship-button.react.js
@@ -7,7 +7,6 @@
 import type { SetState } from 'lib/types/hook-types.js';
 import type { ThreadInfo } from 'lib/types/minimally-encoded-thread-permissions-types.js';
 import { userRelationshipStatus } from 'lib/types/relationship-types.js';
-import type { LegacyThreadInfo } from 'lib/types/thread-types.js';
 import type { UserInfo } from 'lib/types/user-types';
 
 import { userProfileActionButtonHeight } from './user-profile-constants.js';
@@ -20,7 +19,7 @@
 };
 
 type Props = {
-  +threadInfo: LegacyThreadInfo | ThreadInfo,
+  +threadInfo: ThreadInfo,
   +pendingPersonalThreadUserInfo?: UserInfo,
   +setUserProfileRelationshipButtonHeight: SetState<number>,
 };