[oppositelock]

Interoperability is a lot of work, and requires agreements on interchange formats, which is even more time consuming, and it won't sell more devices, and once you have this, you now have to worry about security.

Technically, it's certainly feasible and you do have specialized deployments where devices use mesh networking.

Governments don't really limit peer to peer tech.

There's simply better return for R&D dollars developing other features.