I'm mostly a sabre metrics guy, but I have a soft spot for old school so I'd like to weigh in on y wins MOSTLY don't matter but are not COMPLETELY useless.
There r obviously tons of bad luck losses and good luck wins, esp out of the bullpen, but the only limitation on looking out outcomes (Ks BBs HRs etc) is that pitchers pitch in games not on computers. So even though pitchers usually want strikeouts and outs instead of hits and walks, their #1 priority (hopefully) is to win the game. So for example, when up 8-0, they may groove fastballs to get outs, and in the process give up a HR or two, that every single stat will be affected by except for wins, which is literally the only one that pitcher is thinking about then. Now this is not often the case as usually a pitcher wants Strikeouts, but again, not always. Another example would be a pitcher trying to go deep who can tolerate some hits in order to get quicker outs, even though if he tried his hardest, he could probably strike out more guys and improve his stats. Again, MOSTLY useless but not COMPLETELY useless.