"It irks the crap out of me when people say don't worry about the boat just go sail."

Especially when they beat you...

I think a main reason people here focus on setup is because many folks have "complicated" boats, with lots of settings. Also, many of us are engineers. And, it's easier to "see" and "control" setup than it is to sail correctly and repeatably, since no two sets of sailing conditions (within or between races) are ever identical, and even with GPS tracking, you can't really measure what you're doing with the stick and sheets.

EDIT:

"How about worry about the boat AND go sail." The best sailors do exactly this. The trick is to find the right balance, and at some point, you have to forget about the settings and sail what you have."

Mike