@shanselman the one thing I hope can eventually be supported by Mastodon (and/or activitypub) is letting your "aliased" name (i.e. [email protected]) act as your primary identifier despite actually using mastodon on your server of choice. So, e.g., your custom domain-ed name could be the identifier you see across the Mastodon UI since it's back-referenced to your alias set on the server. That way your identifier stays consistent even if you switch servers and could also == your email address.