The devs either aren't paying attention or don't care because their are massive imbalances.
NIN still has the best CD in the game with only a 60 second CD while BLM has nothing.
At least SAM can bring slash debuff if you don't have a warrior. Oh wait, of course you have a warrior because DRK is broken.
If a class isn't going to have any utility they have to do significantly more DPS than classes that do otherwise they are worthless.
The same goes for a tank with no utility and the weakest defense. If they aren't doing significantly more DPS then they are worthless.
Alternatively lower the DPS of classes with such good utility like NIN BRD MCH and DRG. Otherwise BLM SAM and DRK are dead weight and it is not fun to play as a class you know is hurting your groups. Even a crappy buff like RDM is enough to keep them for being a waste of a slot.
I don't understand how they can let such glaring imbalance go unchanged.