All the EXP earrings have worked that way. The problem is that the EW raids gave more exp, relatively speaking, than the other raids. This change is just bringing them all in line with each other.
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Um... level 90 raid alliance helped me max most of my classes, but a little bit too fast. I shouldn't be leveling twice in a dungeon, especially when exp is so fast to get at this point. It does help getting away from trash Crystal Meth Tower in which they should nerf the exp instead to avoid people just doing the daily roulettes for it.
By the time the deep dungeon is out most people will have leveled up all the jobs they wanted to 100 anyway