I kinda figured that battle classes (not including DoH/DoL here) are relics of a past time, that is, 1.0. Many players were not happy with the classes, they wanted more classic FF classes and improved class identity. So the devs just sorta added jobs on top of the existing class system, since I don't think they could have easily renamed everything and changed all the associated quests. I can see why it was a good idea for 1.0, but it does seem needlessly complicated now.

I sort of wish that they'd just done away with the whole classes/jobs distinction for 2.0, when they were re-doing everything anyway. I don't particularly want to see classes removed now, though if they do get around to revamping classes and/or jobs, IMHO they will have to be very careful with cross class abilities. Not gonna lie, I miss my 1.0 "battle mage", but I'm pretty sure the devs don't want anything like that running around the game. xD