Yes but imagine if you could take your email address and just log in using a different provider. Probably you wouldn't even claim to be using "Gmail" or "Hotmail", you would just say you're using "email". Just like we don't say we're on Damus or Amethyst or Primal now, instead we say we're on "Nostr". Better protocol in that disruptions may not be painless, but they are much less painful.