I actually did a Sync'd Ifrit Normal run a couple days back for the sake of it (I'm already 49/49) and it was the most fun I had with the Job so far. Even having access to more spells than the other party members at Lv22 didn't make me broken. I ran a semi-DoT build that actually gave me an idea.

What if they adjusted BLU slightly to be a Support DPS that focused on DoT application and then consuming DoTs to apply various effects on the party? Like you could consume DoTs/Debuffs to apply Mighty Guard on the party, the more debuffs you consume the longer it lasts/stronger it is. Do the same with White Wind, make it consume Debuffs and the more it consumes the bigger the heal to all players around the BLU. You would, of course, have offensive options that did enough damage to justify consuming all your debuffs on a target, perhaps a spell that was itself a DoT that had a higher potency the more debuffs it consumed. So the goal of the main rotation would be applying as many debuffs as you can, then consuming them to apply a single, even stronger DoT, then getting your Debuffs back up.