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Isn’t it?
Your ID, along with the canonical data associated with it, is tied to your instance. That’s how the protocol works. There’s no mechanism for decoupling all that.
Mastodon has a half-hearted migration feature.
Nomadic accounts are currently not supported by ActivityPub
Good to see there’s at least a proposal though.
Any service can implement this today, with activitypub. Being an enhancement proposal is just an attempt to standardize extensions to ActivityPub, lots of the time that services have already implemented.