Slacker D, you offer at least two important points. The first is explicit- sometimes " 'cause I want to" is plenty of reason. The second one is implicit, but might be called the rule of If It's Too Loud, as in

If it's too loud,
you're too old.

CMcG wisely posted this thread on the modern forum. Being traditional is fine, especially for us old guys, but for modern, I think just about anything goes. And, like they say, if someone doesn't agree, they don't have to look.