Here is my two Gil.

PLD has to be able to free up a Whm position.

Between having a PLD be able to semi-sustain themselves but still needing two Whm's because the dmg taken is too much for a lone Whm Vs. Having a War that is completely dependent on outside healing but fully utilizes the potential of both Whm's people are going to take the WAR every time.

It is asking do you want extra healing which isn't necessary or extra damage which is actively helping kill the mob RIGHT now and thus making the fight shorter?

Either we need to get our DD out of the Tank or replace a Healer. Thems the dice. May not be fair but that is how it is. Until Pld can safely and fully replace a Whm slot so another DD can be put in WAR will always take precedent.