There is also something which Bluesky gets right which the fediverse does not. I mentioned that Bluesky uses decentralization *techniques*, and the most important of those is content-addressing. This allows content to exist even when a server goes down.
This is a great decision and I have advocated that the fediverse do so as well. In fact several years ago I wrote a demo in @spritely's early days showing off how one could build a content-addressed ActivityPub in a spec-compatible way.