For #ActivityPub the question of "Why use #LinkedData?" has never been answered. There should be clear merits to wade through all the complexity that this choice brings, right?
Yes, its ultra flexible, and you can define your own semantic #ontologies, and theoretically it could provide a robust extension mechanism to AP protocol. Except that right now it doesn't.
What's the vision of a Linked Data #Fediverse? What great innovative #SocialNetworking #UX would it bring, that makes it worthwhile?