How is this different than an iPhone or iPad? I never shut either of those devices off.
I rarely have to specifically charge my iPhone... the time that it's plugged in to my car anyway (for CarPlay) is usually sufficient to keep it in a good range. If I do need to charge it, it's a simple matter of setting it down on the charging pad on my desk or nightstand (compared to having to find and plug in a lightning cable... yes, I know, first world problems!).
The other big difference is that my iPhone NEEDS to be on all the time, so that I can be accessible. I could shut it completely down if I wanted to save battery life, but I get a benefit from leaving it on all the time. With the APM, it just sits there and wastes power, with this serving no other purpose than to save me from having to turn them on when I want to use them (again, not unlike leaving your car idling in the driveway so you don't have to be bothered with the huge hassle of turning the key the next day when you're ready to drive to work again).
If Apple added the ability to power them down, I would not do so every time. There is a degree of convenience with being able to just grab them off the stand at any time and have them instantly ready to go. But when I'm heading to bed I'd like to be able to turn them off for the night.
Look, I get it, to you this clearly falls into the "not a big deal" category. But to others, it's a deal killer (and it was a borderline deal-killer for me... if these headphones hadn't sounded outstanding, I would have returned them).