Which is exactly the problem here. There is nothing that WAR does better than PLD except maybe aggro a group of mobs slightly more quickly. However everything that a tank is required to do, which is basically boiled down to not die while being hit by the boss, is done better by PLD. This is why WAR needs tuning, and by tuning I mean buffing, and by buffing how about if fucking Caduceus doesn't literally kill me in 3 hits?
But if it did significant DPS, I guess it would make it a more interesting class instead of just buffing his defense. I guess my point is that it is not wrong for a class to be less effective at its main role if it can bring interesting support together with it.
I would first increase WAR's DPS than its defense. If a WAR party kills something 10% faster than a PLD party, then it's worth it to punish the healer a little bit.