if every class had like 8 skills that mostly were just focused on damage sure. But that isn't the case. this is a game with 30+ abiltiies per class. How do you balance tank invulns and utility skillls like red mages manafication, gunbreakers extra 3rd catridge and bloodfest, and all the other various party buffs and non-potency abilities to be on par with not having them at all?

How about regens? how about classes that just gets more stacks of the same ability later on? (like astros essential diginity having 2 stacks at higher level, versus 1 stack at lower levels) etc etc.

try to think a bit futher than just damage potencies, and you'll see why this would be a massive undertaking.

A more realistic solution to this could be to unlock skills faster.