@eludom UUNET is something I used back in the day.
I doubt very much that, like TCP/IP it was a complete and adequate protocol.
My focus is here and now.
I may look at existing approaches such as #XMPP and #Nostr for comparison, and perhaps even #UUCP now you mention it but I have limited time and won't make progress if that's all I do.
You suggesting UUCP as a solution to today's problems isn't convincing because first I want to hear from you, what problems and how it solves them.