I probably won't use it, simply due to time availability. Haven't even started 5.0 yet. But, that very reason kinda has me interested as well. I'll often take breaks from story to level up extra jobs. Or, as mentioned, the leveling process can leave larger gaps between job quests. Would be nice to go through it all continuously.

Hell, maybe that's all it would take to actually get invested in some things. For the life of me, I still don't remember why I should be so broken up about Hachi-... Hatchoo-... whatever the hell that guy's name is.