This is the crux of the issue right here.
Traditionally, Dark Knight has always been about lifesteal effects, but for some reason WAR jumped in their first and hasn't let go of it.
WAR could easily be the 'resilient' tank that has insane mitigation, reducing damaging taken instead of recovering HP.
DRK should have got the effect of Bloodwhetting instead, in fact, it should have been baked into Living Dead, not Raw Intuition.
In fact, in SB this was what DRK could do, I remember some insane dungeon pulls with Abyssal Drain spam that made me as untouchable as a modern Bloodwhetting WAR is.