I have been pondering a lot of things about the job system that is approaching soon. One of the letters mentioned that jobs are for group play, while classes are more for solo.
With these recent battles we've had, such as Ifrit and Batraal, some problems came to me.
When you become a job, certain moves will be locked out from certain classes.
So for example of my problem:
Let's say I am Black mage (Red Wizard ;3) and I am in the Ifrit fight. He's getting close to using Hellfire. I see the nails rise and what not. I try to use sentinel. There would be the possible problem. While others are classes they get to use other abilities from other classes. Me, being black mage, might not even be able to use sentinel anymore there for rendering me a possible hinder to the party rather than a help.
Unless moves like Emulate, and stoneskin become vastly strengthened from me being black mage, which is highly doubtful considering white-mage has always had better enhancing skills, I am going to die, or be very close to death.
If important abilities are looked out during a fight that are very important, I don't see how jobs could be a good for party fights.
During my experience during Darkhold runs. The mages heal the tank, while the DDs raise the dead players and heal themselves. If these moves are lock under certain jobs, then the mages would be forced to waste mp that is needed to keep the tank alive, by healing others and raising. Which can be a problem for some of the players.