There are players who do not play like you Physiologic - they don't like to be out in front. There are reasons why warbird builds exist and people choose it over dex bird. Personally, I find it an unacceptable loss in firepower. Others clearly disagree and there are plenty of dual-spec birds around. Same with people who choose hybrid int (70% int, 30% str) over pure int mages.

There are also a few strength birds around. A lot of these players tend to have very high PvE K/D ratios because of their play-style.