Yes you can throw a 1 hitter and lose. Yes you can give up 10 runs and win. SO WHAT!!! Show me someone who consistently throws 1 hitters and I will show you a 30 game winner. Show me someone who consistently gives up 10 runs and I will show you someone who is no longer around. W/L is just one tool, not the only one.
I love how you articulate how stupid it is and follow it with a "so what?" Exactly-what-you-said-what!
Let's do an experiment. Just randomly looking at this year's pitching leaders, I've picked out a few pitching lines:
ERA G CG IP H R ER HR BB SO
4.16 32 1 179.2 181 84 83 27 58 134
3.86 31 0 186.2 159 83 80 27 58 209
2.98 31 0 193.1 150 73 64 21 51 230
Rank the above seasons and match them to their win records:
14-6
10-12
18-11
Now these two look like the same pitcher, right?
ERA G IP H R ER HR BB SO
3.92 31 186.0 201 93 81 20 37 130
3.90 33 191.1 204 90 83 20 55 124
One is 17-9 the other 10-13
Sure, it's a tool, but more like the human kind than a hammer.