Ultimates maybe since you can make a pre-formed group to do content (though it's hard to know if they'd be able to clear or not... I never do ultimates so I can't speak to that end)

BA is probably a no considering you have to go into Eureka to do it, and Eureka is instanced content you're not entering with a preformed group of entirely blue mages. The instances can hold hundreds of players, so more than you'd be able to make in a PF situation and queue in. And it's likely that similar to PvP, you'll be locked out of changing jobs to blue mage one in Eureka.