I'm really interested in the portable "nomadic" identity that #Hubzilla
protocol offers. I think a lot of folks joining #Mastodon
atm are unimpressed with the limitations imposed by the #ActivityPub
protocol when moving instances, and lack of redundancy if your instance shuts up overnight.
Hopefully more of the #fediverse
incorporates something similar to Hubzilla's ability to have a main profile that can move with you, while also cloning & syncing across instances for backup, and redundancy.