There have been some posts about ActivityPub I haven't replied to. I think a couple of them were directly trying to bait my interest, given how often I have talked about Worse Is Better and lisp machines vs unix here, and how I have been talking about bringing object capabilities to ActivityPub since before AP was even a W3C recommendation. (You don't need to throw out AP to do it.)
However, instead of just writing about things, I'll be building solutions. Announcement coming early Feb.