[chaosharmonic]

This would have been a great way to deal with Facebook's attempt at building out a single backend for their messaging platforms.

Because yes, the ability to use a single protocol for cross-service messaging, with E2E by default, disappearing messages, and text (or presumably email) fallback would actually be spectacular. But as a spec.

Hell, as a spec, this would create an argument to migrate toward a user@service model and finally start relegating phone numbers to legacy status.