I wouldn't think of it as Gridania being unfairly lacking but instead as just having an open slot to be filled by something later. As Eidolon mentioned above, Limsa was short on combat classes until the rogue was introduced. I'm sure there is a list of things in development where that space may be filled by a new crafting class or maybe something totally unique down the line. MMO's are kind of like a constant "work-in-progress" in that way.