WITHOUT DOUBT! winning is everything.
but if you have one pitcher who goes 8 innings and gives up 1 run and his team loses 2-1, and another pitcher who gives up 4 in 6 innings and his team wins 7-4 the vast majority of people can conceptualize that the first pitcher is better, and with run support and in a better environment he would win more.
It's almost as if people think this is a zero sum game, that if you look at other metrics it means that nothing else other than those metrics are unimportant. Of course ERA and W% matter, but if you have a guy on the worse team with the worse defense and the worse coaching behind him but he's striking guys out at an elite level, eliciting weak contact, throwing heat, piling up innings etc etc etc. there's value in looking past just a win loss record or era. I think on some level we all know and agree on that.
In a few months we will have better things to argue about.