You could, but what % of running servers actually have such safeguards in place? I'd say almost none of them.

The next Dread Pirates Roberts would be interested in this safeguard

I don't believe that specific product addresses it at all. Undoubtedly the persons operating the kits have put some thought into it, but given the myriad of possible LAN configurations and types of software deadmans switches, it must be a difficult problem to solve.

Or motion, inactivity, vibrations in the room, etc. But that’s for another product/specialist I guess?

There used to be an OS X program that would lock the computer if it detected motion. As long as a trusted Bluetooth device was paired, the computer was fine. But if the device left range and someone touched the computer, it locked.

There was also one that would use the motion detector to try to detect if the device was falling, and park the hard drive heads before impact.