i agree with the analysis about the ledger being copied across servers. it seems wildly inefficient and like a major security concern. i actually deleted an account on a FRIEND’s server because i joined some pretty-active public channels on onther servers and they found that i was using some not-insignificant portion of their server resources just to log channels i would pop into on occasion.

xmpp with omemo hasn’t been mentioned but I would be perfectly happy if we all switched to that