In the current process the best-practices gathered from throughout the decentralized developer ecosystem aggregate by emergent forces to form the fediverse at large. The #SocialHub #FEP process acts as a funnel that directs experience towards further adoption in formal #ActivityPub et al open standards by the W3C #SocialCG
If what you say is right, then TIL.
However, I've seen people move from A to B to SELFHOSTED to C and delete SELFHOSTED.
In which case, I assume, also taking what you write, that the redirection will stop somewhere.
Also, if I only move from A to B, how long will A keep a record that I'm now on B ?
There are plentiful long discussions and history on the subject matter, and multiple solutions being discussed among which various forms of - what's current called but may have to be renamed - nomadic identity. #ActivityPub enhancement proposals #FEP's hopefully bring a measure of standardization.
See e.g. this long discussion on #SocialHub at https://socialhub.activitypub.rocks/t/nomadic-identity-for-the-fediverse/2101/97