There are many better ways to discover new communities and the all feed causes a lot of moderation issues (basically as soon as a post has enough upvotes to show up near the top of the hot sorting on all, you see loads of low effort troll posts).

But I wasn’t seriously suggesting to remove it, rather that the local feed is much more useful than the all feed (on thematic instances) and thus if any feed would be removed if should be the all feed first.