Originally Posted by
BillyKaplan
An entity within the lore with a pre-established skill-set you equip on your character and run content with. Skills and lore are unlocked via additional quests. Can hit max level cap, which is upgraded with every exception.
And just in case you still found some holes to pick at it, the fact remains they presented BLU as a Limited Job in fanfest, setting it apart from regular jobs, and then proceeded to explain how it differs (DF lock, max level currently at 50).
Saying it's a "Limited job" would require them to add an explanation? Then they should've done exactly that.