Or the M4 Mini power button...

on the bottom (both) WHY?

To let the user know that you shouldn't [use it while plugged in]/[bother turning it off]. I don't like the choice, but that's why.

That would still be bad design if it should not be used and charged at the same time. I often charge my Logitec wireless mouse while using it.

I know 3rd-parties have created work-arounds to the MacMini's switch, but for mine I just stand on its side (against a shelf's wall).

Like your mouse, I just want to be able to use it.