Originally Posted by
Niwashi
I'd give a few levels of leeway after 30, so Brayflox could still have classes. While it's important for tanks right away, some of the DPS jobs are basically just a stat boost at the cost of fewer cross-class skills up until they get another quest or two. NIN, for instance, doesn't start to feel like much of a job until getting Katon and Raiton from the level 35 quest. At 30, all they get is Fuma Shuriken, which isn't all that great. (I think I've only ever used it when soloing if I wanted to pull a mob from a greater distance than the throwing daggers can, but in group content pulling is up to the tank.) Though personally I've always gotten and used my jobs right away, even if it was just for the stat boost, I know some players who prefer to wait until their job skills are more useful than the cross-class ones they replace.
So maybe around 35 or 40 they could start making it a requirement (except in pre-formed parties).