@wjmaggos I'm really surprised you haven't heard those arguments since I see them plenty.
From questions about the technological design through questions about the centralizations on instances, which come with their own moderation problems, through issues with the general norms of the platform built on it, there's a lot of reasons ActivityPub isn't a particularly good fix for complaints against social media.
Even the fundamental concept of lack of central algorithm has led to users not feeling well served by the platform.
These complaints are not hard to find, even if they aren't obvious.