> Ideally, I'd like to have me@mydomain.com as my persistent XMPP ID that I can freely migrate across servers just by updating a DNS record without having to worry too much about who is actually hosting the server. The AT protocol does this right.

I suppose here you're saying "I should be able to do this without providers having to do work"? Like you show up with lxgr@foo.com to bar.com and create an account, and everything kinda fits into place (modulo you having to set up some DNS?)

It is already possible of course to have XMPP server at domain A handle things for domain B as well. But it is cool how ATProto seems to really bake in the concept of "all domains are welcome".