WARs and DRKs can do incredible damage with THF SJs. (Spinning Slash and Steel Cyclone)
MNK can Chi Blast 1500+ damage (Not near what WARs/DRKs/BLMs will put out, but it's damage so meh.)
Dunno what kind of dream world you're in, but magic bursts from BLMs have always out damaged me as DRK when I use a 300 TP Ground Strike or Spiral Hell. SATA spinning slash really is pathetic on HNMs at 100TP. A good chi blast almost always out does most Spiral Hell, Ground Strikes, and Steel Cyclones. Then again, I only have 1/5 of hecatomb and bard never focuses on DRK in the stunner party in my LS(then again, we only have one bard main in the LS who isn't usually in the stunner party anyway, so moot point).