One thing the fediverse really needs is the ability to authenticate as the same user over multiple services and post as the same user. Eg. if I could use @sam on a Lemmy and PeerTube instance and have it all be the same user that would be great.
XMPP based social networks do this a lot better (one central account I control, lots of different front-ends that all show data and connections differently), but they don't do authorization well (you have to type your username and password into every separately website and give them access to every other sites posts, messages, etc.)
@dean I don't know what they do, but the fact that they all have to be hosted in the same place makes me think they're just provisioning different accounts with the same username on each. Not quite the same as a single account on one instance with all the posts that you can log into with various clients that create different types of posts.