What if they made it so that Blizzard and Water were available as cross class skills in the way that stone, fire, thunder, and aero are. That way if you wanted to you could have all of the elements available to you as a class, or if your job had both CNJ and THM spells available [Granted if on a job you probably wouldn't set all of them at once.] you could use all of the basic level elemental spells. Just a thought.