Mostly a CYA situation as far as CPAPs are concerned....IMHO
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Exactly right, however there are 2 issues, a portable generator doesn't necessarily produce a clean signal, and generators typically have shutdown features for various things, low oil pressure, overheating, things like that. Since they can shut down with no warning they could leave you without the "medically necessary device" while you are sleeping. Hopefully one would wake up and realize that something was wrong,,,,,,
We built an APU, auxiliary power unit, as a proto type system for evaluation for the military. That unit had a "Battle Field Switch" on it, over road all safeties, over road all breakers, no matter what happened that unit would keep running until the system burned up or the engine wouldn't run any more! It was a diesel and even the default position of the fuel solenoid was on. I guess they didn't want it shutting down when they were under attack!
We were up camping in the bush several years back, me and my kid and my dog in one tent, in the middle of the night my kid got up and moved to another tent, couldn't figure out who was louder, me or the dog! But they figured that we didn't have to worry about any wildlife coming around, the noise would scare anything off!
Your Battlefield Switch makes me think of people who insist on overload protection on a series winch motor. Better to learn how to use the winch than have the breaker trip at the wrong instant for the wrong reason.