I can do without being able to queue Roulettes or normal DF with BLU. That's honestly opening a giant can of worms that should be left alone unless they change the entire job itself.

However I feel like it should share the same level cap as every other job in the game and as such be able to queue into things like Eureka and Bozja given the way those zones were made. Additionally if they aren't going to put actual stat/substats on the BLU weapons then possibly have them provide boosts to certain spells, spell types, elements, etc and have some spell combo's that don't rely on status effects that are more usable on higher level duty content where enemies are immune to most if not all status effects.