How to correctly use selectors from entityAdapters in redux-toolkit?

Question

React

Created the post entity

const postsAdapter = createEntityAdapter({
    selectId: (post) => post.postId,
});

The posts are part of the feed side, there is more code, but I cut it out. essence will not change.

const feedSlice = createSlice({
    name: 'feed',
    initialState: {
        posts: postsAdapter.getInitialState(),
        lastPostId: undefined,
        loading: true,
        error: false,
    },
    reducers: {
        postUpdate: (state, { payload }) => {
            postsAdapter.updateOne(state.posts, payload);
        },
    },
});

Also created a selector

export const postsSelector = postsAdapter
    .getSelectors(({ feed }) => feed.posts);

And, accordingly, there is a component that renders the list of posts and the post component itself.

In the post, I get the post itself from the store through useSelector + post entity selector

const post = useSelector((state) => postsSelector.selectById(state, postId));

And after changing the post, by calling the action "updatePost" from the code above, the entire list of posts is rerendered. Just
in case, the Id list was also taken into the selector in the component that renders the list

const postsIds = useSelector((state) => postsSelector.selectIds(state));

But the result is the same, all posts are rerendered

And it’s not clear why the hell these adapter selectors exist if there’s no sense in them