Because it's inconceivable that someone would reach for the volume button and accidentally hit the settings button, right? It's not like stereos ever have buttons next to each other, and it's not like cars ever go over bumps or anything.
It's not really rare. I've done it a few times, what with trying to reach the station dial while also concentrating on the road and accidentally pressing it in, causing the settings mode to activate.
And honestly, how often are you in the settings that it would annoy you? So you go in there maybe two times a year to adjust your bass when you stop liking house music and start liking indie rock, and that only takes a few seconds, so what are you doing in there that requires an extended period of time and enough contemplation that you wouldn't be able to immediately alter the settings and instead would have to pause for >10 seconds?
I change the front-back fader all the time depending on what I'm listening to and who in the car wants to hear it.
I don't consider it a big problem, but you did ask. You can't do it while driving since depending on the mode the same control does a while bunch of different things.
