I expect if you unfollowed everyone for it to show absolutely nothing, leaving a "consider following these people" prompt. And otherwise when I reach the end of new content, show me a "you reached the end of your unread content, consider following these people to add more".

Having a clear "you are caught up" point probably isn't positive for engagement metrics so I understand why they don't do it but I'd rather the app be oriented towards UX than to be oriented towards engagement metrics.

... nothing?

Not the one you're replying to but I unfollow all, but a couple people.