The self heal gap just got bigger is all. Issue with DRK self healing is unlike PLD/WAR, DRK really doesn't have their heals on demand like the other 2. SoSu is contingent on an add dying, Abyssal has a hefty cost for so little returns and Souleater requires Grit and 3 GCD's to pull off.

With PLD/WAR your gate to entry is much lower.