A structured network strategy to sync Nostr relays I think can greatly help the persistance and reliability of messages. Negentropy is a huge help. For example, if all admins independently run relays and have write policies exclusive to members/admins, the relays can sync and secure only those messages between each other. Strfry has some support here with a router. However, last I remember, the features were new and could be optimized. I would need to look again.

Yes, and now do this with relays on the phone and fips connection between them, cypherpunk future is now.

Sure, in some cases! Though, the notorious flakey internet connection of phones adds complexity and difficulty. Local messaging use cases could also benefit from wireless connections (e.g., LoRa/Bluetooth/Wi-Fi). In other cases, relays with low latency and high availability would be useful to bolster reliability. For example, with redundant-powered SBC or VPS relay servers with multiple internet connections/transports.