No, I'm a cable maker who doesn't really care one way or the other. What I design I design for my own subjective pleasure. Whether that subjective pleasure is due to actual audible differences or something else doesn't really matter to me.
Cosmetics/aesthetics certainly play a role. Bottom line, I ultimately want something that, to me, sounds good, looks good, feels good, and when possible, even smells good. Or, as I said to someone earlier today, first I make sure I get the basics right and after that I feed my soul. I don't listen to reproduced music just to satisfy some purely objective goal.
I don't know. All I know is that to date no one has demonstrated conclusively that there is, at least when whatever differences there are are below known thresholds. And because of this, I can't bring myself to adopt any sort of blind faith religious belief that there are audible differences. But as I said previously, ultimately it doesn't matter to me one way or the other. If it could be shown conclusively and unambiguously that there aren't, I wouldn't do anything different than I'm doing now.