Well, for me it was that SCH was much more versatile than a BLM role. Black Mages nuked and... that's as far as their capability goes. Maybe a few cures to help out in healing, but not very effective. SCH could enfeeble, heal, nuke, and use all of their spells in innovative ways with the fact that they could apply them to multiple mobs instead of one [i.e. graviga, bindga for added crowd control]. Oh, and lets not forget stormsurge which added +7 to your attributes as well as damage increase for magic attacks according to the element applied ^^b It did a lot more than just step on toes