If BLM could heal better than a WHM, WHM would be a broken class.
So when WAR can tank better than a PLD, why is the PLD not broken?
For anyone to claim, in most situations, that an average paladin can tank better than your average warrior they are just talking nonsense.
Let's reflect, and tell me, if a DoM that was ment for damage dealing could heal better than a DoM that was ment for healing, would it not be broken? I look at the PLD/WAR issue exactly the same.