THEY ARE COMPENSATING WITH SIMILAR DAMAGE REDUCTION FOR THE AFFECTED CLASSES. Please READ the blue post that I quoted and linked to.
Holy shit why do I have to keep saying this. Stop treating data mining of the very first PTR patch as gospel and indicative of Blizzard's intentions.
They said they're compensating by buffing resilience. And as far as I know, resilience affects all classes, not just those classes. So no matter how you see it, those classes are still nerfed by the 15% dmg reduction being gone.