Dude, switches fail. You know it, I know it, everyone knows it. There’s more parts. Moving parts at that. And all of those parts can break.
Switches are also apt to get bumped on. Twist lights don’t do that. Turn them off, press on the bezel to make sure depth pressure won’t turn them on, and go about your life.
A bumped on backup that’s on for hours and not noticed (cough cough the one in your pocket) is not good.
Innovation doesn’t automatically mean it’s better.
The faf you’re describing with testers, chargers, switches, etc is without point. 3 alkaline LED scout style (halcyon, heser, whatever quality piece you’ve got) straight up works. It’s tried and proven.