Now in theory, you could have a DC-like app that uses other protocols to add extra features, but keeps email protocols for text delivery and attachments, and whatever else it can do. But I'm guessing there's reasons OG Jabber wasn't built around email protocol. Just like there's reasons OG Twitter and the fediverse weren't built on XMPP.
But maybe a graceful fallback to email delivery could be a thing in for private messages in apps that use realtime federation protocols?
(3/3)