The full thread has a lot of speculation without basis in fact (eg why a given VC decided to invest in bsky), and the primary technical argument involves some theoretical issues vis-a-vis rebuilding the network if 25%+ of users decide to migrate out.
I don’t put that much stock in such critiques when a project is still evolving, learning lessons, and most importantly growing.
Most of the complaints coming from the mastodon crowd feel more like emacs vs vim “debates” of yesteryear.