When I play my BRD, or another dps, I'm always looking at ways to make my damage go up. I examine my skills and try to come up with new rotations that will increase my dps. I don't need a parser to know if my damage is going up or not, since I know for a fact that it is due to the efficiency increase. I also don't need one to see if another player is performing poorly. Play the game enough and it's pretty clear most of the time.

I'm usually on the fence about parsers though as I don't like them, but do see the usefulness of them. However the more I see people try to give their reasons for having them, the more I lean to not wanting them at all. Your arguements aren't helping your case, they are hurting it.