So the reason to have the DID in control is for users that say sign up for Bluesky and have a bluesky handle which is a domain they don't control and want to mo

So the reason to have the DID in control is for users that say sign up for Bluesky and have a bluesky handle which is a domain they don't control and want to move to a different provider without breaking everything. If your handle was the thing in control then you must own a domain to own your account and move providers. That kinds of defeats the purpose of migratable PDSs for the "rest of us" use case.