Some people look at a full MP bar on DRK and think that the job is too easy. I look at a full MP bar on DRK and cringe at the dps loss.

It's less punishing when you mess up, but as a result, players generally don't actually realise when they have messed up. There's significantly more to keep track of as a DRK in SB, and you can easily lose a ton of dps without noticing if you're not careful. Delirium windows are the biggest culprits in this regard.