Since Mastodon uses pubsubhubbub, does that make tewte delivery a non-guaranteed operation like UDP? I think that's acceptable, and better than Matrix's weird blockchain-esque model
Migrating my Mastodon handle should be as straightforward and decentralized as migrating my SMTP and MX records
If for some reason I loose access to whatever server hosts my Mastodon handle, I need to be able to point my name elsewhere