Uh... no? PLD can put all their eggs on VIT and still have enough enmity through proper use of their skills. So can WAR, but all the self-heal abilities of WAR will suffer if you do this (except Thrill of Battle, I guess). You are also choosing to forget that DPS can control their enmity gain at will, while PLD also requires less heals due to inherent mitigation, which means they need to generate less enmity to begin with when competing with healers.
Tradeoff of having more mitigation on gear is... better mitigation skillset than their tanking counterpart? Jeez, PLDs sure have it hard. At this point I don't really care if you want to call it itemization problem or mechanics/job design problem. The point is that PLD gets more passive mitigation for the same gear as WAR, which is not compensated on WAR gear in any way. You could compensate this by WAR weapon having more damage, WAR weapon having separate parry modifier or plethora of other things that would make WAR that one bit more unique when it comes to gear.
