Warriors generate more or their DPS from yellow damage. Thats why the acceptable hit rating for warriors is lower that a rogues. Rogues are more dependent on their white damage. Also, I think one part of the reason people say 200 is if you have any more, you can end up with more rage than you can use instead of stacking another stat somewhere else to make those WW's and BT's hit harder.
Shhh! Theres a dead horde in my trunk. Wanna see it? Fuck around and you'll be it.