Yes Black Mages had access to spells like Bio, Water, Quake(WHM has Stone tree so Quake is going to them in the future), Drain, Osmose(Osmose isn't anywhere because they are having a regen effect on ice spells). They lack certain support spells that I believe Red Mage MIGHT get such as Haste and Temper. BLM does have Saber in the form of Enochian. BLM doesn't even get Break to use for Petrification. Since all our CC skills simply do not work in HW content. Rendering them completely useless.

I've also been majorly brooding over the Dark Knight. They don't sacrifice health for big damage. Their MP stealing qualities don't steal MP just gives it to you. If it did steal MP we would have more Enemy is out of MP situations. Dark Knights are missing a staple ability Last Resort which buffed their stats by casting doom on themselves. They don't have that here. It is mostly just a Dark version of the Paladin.