WF DR is not any higher then fleshie DR, in fact I think its worse. Fleshies just use armor, for instance, that marilith chain gives you 5 DR which automatically puts you on par with WF and it's FREE for YOU too. (WF need to spend a 1 feat and 3 enhancements to get that DR).
And why would a tank need to worry about DPS? He just sits there and takes a beating, I would think chugging pots is a perk, would rather have to carry around a few dozen uncurse pots then worry about my 50% divine healing failure.