Like the title says, it's not really something that complicated and I can't imagine it would be that hard to implement. While the cases of wanting to turn off the skin exclusive sound effects are probably slim, it could've been a miss click...

You can answer however you want, just mention the character, the line, and how the voice line is triggered. I’ll use my favorite as an example: when you leave the spike back raze will say “uhhh I think we need the spike.” I just find it fun...