In my opinion it would be better to have a main peertube that displayed the most relevant videos from all instances and implemented that sepiasearch. And leave the details about how to create instances and the fact there are 861 PeerTube websites on another tab instead of the main page where it’s just confusing people.
Dividing instances by interests makes sense in sites like Mastodon but not in Lemmy because Lemmy already has a way to select what interests you.