Many rock bands wth attitude will refuse to play venues with power shut-off systems - certainly the thought of anyone turning even my modest 8 kilowatt system off and on again at the mains makes me shudder for both fuses and speakers (because the "soft-start" will still be hot and the gain up so there will be a huge switch on thump). Oh, and anyone standing near the speakers.

Whatever happened to the anthem of the 60s and 70s - if it's too loud you're too old. Kick drum on rock music should be felt rather than heard.

Acoustic-style music (and folk) is different. It doesn't need to be that loud, merely clear, and it doesn't need the physical bass. The primary need is to avoid high frequency splatter and mid-range intermodulation. Turning down usually helps with both of these.