Being able to centralise your own identity server (with your choice of authentication method ideally) and federate the services/content would be a great option for those who want one identity across the fediverse.
New to the tech, but if that identity server could also act as your ActivityPub ‘master’ server for all services so you have a login that when entered to any instance would show all your messages and subscriptions could make for a great experience.
The specific point for me was the attacks on @christianselig@mastodon.social from that dumpster fire of a website.
I had been looking at Mastodon since @deviantollam@defcon.social spoke so highly of it and the platform it provides for marginalised groups but personally dislike the microblogging format, and when looking for Reddit alternatives it seemed like Lemmy would be a catch all for me. Looking forward to the integration getting tighter to expand discussions across the fediverse.