I wish i could host my own simple lightweight identity provider and authenticator that is used for fediverse instead of creating accounts everywhere. Relying on fediverse to maintain both content, but also account info, seems like a really bad idea in retrospect (even if one day we get proper ways to migrate accounts but not even Mastodon does that well yet).
It's probably be relatively easy to establish services offering these for less tech savvy people later so they can just have a central identity service with which they can roam around in any fediverse they want later.