One thing I personally like more about this than about Briar - routing of messages.

It seems Briar exchanges state of the groups with the neighboring devices, they with their neighbors, and so on.

That might take a few iterations (thus delay) to propagate a message from, say, one side of the crowd to another, and leave different members with different state all the time.

While here, apparently, messages are routed further immediately. From my own toying around - not the best thing too, but initiating synchronization by sender\relay and not by recipient seems sane.

Maybe should rewrite the toy to be nicer. It seems to be closer to real world things than I thought.