Trying to understand the complaints about DRK

[Rubytoe]

The problem is, if TBN use is a flat DPS gain, then TBN becomes a DPS ability and you stop using it when it matters, but as much as possible.

but that'd be up to the player's choice. Just like how black mage has to decide to move out an aoe and loose dps, or eat it "possibly die" and keep casting.