The self-heal element of Path is irrelevant, because it's generally such a low heal as to not matter. No WAR worth their salt relies on Path for healing. They use Path before Tank Busters, because of this part of the tooltip: "...and lowers target's damage dealt by 10%". That's the part that matters.
And, if you're a PLD, you have a shield, which is GREAT against physical attacks; use Bulwark & watch Holy Bladedance do very little.Inner Beast. If they happen to be in defiance (MT), that's a 300 potency attack straight to HP AND 20% damage down.
A DRK has self-healing as well; Souleater says hello. Crossclass Bloodbath also says hello & informs you that DRK does have enough Spike damage to take advantage of it.