It sounds good but in practice it doesn't work out; laptops sleep, people put their phones on airplane at night, whatever happens in life. The "best" solutions use some sort of cache-and-forward relay (thinking like DeltaChat relays, or I hear SimpleX is adding them) but I think most end up looking at Snikket (xmpp) or Matrix for the group management etc. on a central server. The Disroot group uses "Movim" which is XMPP highly customized to a social experience.

I use DeltaChat with friends and there's a lot of things you can't do because it's essentially P2P with caching relays - like Jami, all control and data is stored on the device(s). If all you're looking for is a Signal replacement it's great (and why we use it), but if you want good group social controls you gotta go the central server route.

I think Jami here could do with caching relays like Delta has, could move this project to the next level.