Thanks. So it sounds like port forwarding is the major barrier. That and having to remember your IP address and update it every time it changes.

I wonder if IPVv6 would help here? Would we expect to get a static IP address for a device that can stay the same even when we're connected to different networks or via mobile data and wifi? That would mean even different network interfaces in the device would need to share the same address so I guess it still won't happen.