@pfefferle Here's an idea, not sure if it increases usage, but would be neat: allow custom post content configuration for each post type available.
I publish, besides posts and pages, podcasts and forums topics (each one with specific post types) in my WordPress instance.
I'd love to add forums topics to ActivityPub, but I can't right now because their need some indication that it's a forums topic, and not a post.
@manualdousuario good point... I think this is mainly an UI issue... I have no idea how to do that nicely... just talked about that with @linos and @ruru4143
@mattwiebe maybe we should add that to our thoughts about using Block-Editor-Templates for that.