Tank Balance

[Anyndel]

Avoiding a mechanic is also putting less strain on healers. Nowadays, the "less strain" is far too little to justify picking a PLD when compared to the DPS loss, since DPS is the most important aspect of endgame content.
WAR's mitigation is very close to PLD (Especially in magical fights), while their DPS as MT is much higher.

So, if you have WAR+PLD, you either chose to put the WAR as MT because he can do more DPS and you know you can manage all mechanics properly, or you put the PLD if you want to bypass some mechanics. And bypassing some mechanics would allow the PLD to DPS more too (Tempered Will already helps with that for knockbacks, in fact)

WAR MT deals less DPS than WAR OT, you won't put him MT. So it would be more PLD vs DRK, and WAR's mitigation is nowhere close PLD's.