This is the fediverse's fight to lose.
Email was the first fediverse app. It's not by chance that Mastodon handles are like email addresses.
But email is broken, and since its creation, technology has come a long way.
It won't be Mastodon, but we have an opportunity to re-make email with Fediverse Tech in a way that could put an end to fractured messaging apps (no more
navigating email, Signal, WhatsApp, SMS, Discord, FB Messenger, iMessage, etc just to send a message).