The use case that comes to mind for me is transparently and securely tunneling back to a central control server/common network with other devices it needs to ta

The use case that comes to mind for me is transparently and securely tunneling back to a central control server/common network with other devices it needs to talk to independent of the local network. So I could make a sensor for my parents and have it automatically tunnel its MQTT traffic back to my home network to monitor without them having to host an MQTT server locally. There are of course other ways to achieve this, but Wireguard is pretty elegant and straightforward to keep secure. Another thing that comes to mind is if you're building a device that jumps wifi networks a lot. WG makes roaming networks pretty seamless, though I'm kinda struggling to think what an actual use for this might be. Edit: Thinking about it more, you could use it as the backbone of some kind of cross-network mesh system. A bunch of distributed devices connected to their respective local wifi network but then form a common network over WG and are able to route packets. Maybe you could bridge the endpoints to Bluetooth or some other RF protocol as a mesh with the Internet as the backhaul but not having to think about the local network. This sounds pretty wild but would be fun to play with.