Here is a recent annoyance. I use bluetooth headphones and a bluetooth speaker. I want my bluetooth headphones to never be louder than $x, I want my speaker to have the full volume range. There is only one volume control (under Settings > Music > Max Volume) for the whole phone, and that doesn't seem to control max volume for notifications/other apps. This frequently leads to me leaving the max volume on high, then shocking my ears with a super loud noise. I should be able to control max volume per device. I use Sony MDR-XB950B1 headphones btw.