Sometimes when viewing a federated, or local, post with 50+ comments I am interested in seeing comments from my instance (if there are any) first.

So there could be a toggle for that next to the comments sort options.

You join a community (instance) for a reason, and so it makes sense that you might value their comments a tad bit more by default.

And I suppose someone could use this toggle to only read top comments from their own instance. Maybe it’s a political post and you don’t wanna read any .world or sjw comments.