@BeAware@social.beaware.live
Well one easy example of an issue that BlueSky can handle better is account migration.
People using Fediverse rightly point out that moving between instances is clumsy, and that's because the underlying system is all built around instances, not users, so moving between instances is an afterthought that's clumsily tacked on.
BlueSky made different design choices that made users, not instances, the core piece. One implication of this is that the user has much more control of their posts, where they reside, and how they're addressed.
The two design approaches are upside down from each other, so whether you want an instance-oriented system or a user-oriented system determines which system is more in line with your needs.