Dark Knight wasn't even supposed to be a tank, they were literally "physical attacks hit harder, but cost HP", so arguing over how it doesn't match up to lore is a losing battle.

Blood Price's advantage now isn't the MP return, it's the blood gauge it builds, which can then be spent on Quietus against multiple targets. DRK isn't nearly as good at AoE as it used to be, and I don't think the devs are ever going to revoke those changes.

I also can see why they altered reprisal and removed 3.0 delirium, since it was part of the issues with the tank balance. Moving it to a 60 second shared cooldown helped to balance things out.

TBN is the equivalent of an extremely costly 15 second Thrill of Battle/Infuriate. That is absurdly powerful. But I won't act as though that lets it stand equally with other tanks.