> Request was to remove the physical button and rely only on a software (touch screen). Death was a remote harm, but moderate injury / user stuck in device / panic attack was plausible.
Good on you for not removing it.
I work sometimes in mineral processing (above ground | below ground) with conveyor belts, crushers, etc.
Big easy physical power cutouts are everywhere:
Conveyors have "rip cords" running alongside, pull them and you can stop a 30 tonne/hour conveyor maybe before someone drwn into the rollers is crushed to death or maimed.
Crushers | screens | most big equipment has single OFF knife switch with "gang plates" that take multiple padlocks - if you and two others work inside a crusher you each put a lock (three in total) through the gang plates and nobody gets to restart the machin until everybody is out and has removed their padlock.
Big physical switches save lives.
The Big Boss Man hated the way it looked. He once spent 30 minutes telling a graphics designer what a worthless piece of sh* he was where everyone on the floor could hear. Corporate equivalent of a terrorist.