WAIT - maybe I'm thinking of something else. Is it possible that they disallowed the ability for, say, +3 to Fury (Barbarian) and +5 to Arcane Power (Wizard) on the same item? That must be it, because you get zero benefit from those, at least the primary stats are doing something.
Still no, but almost. They made it so class specific items, such as wands, would only spawn with Wizard skills and not say Barb (since Barb's obviously can't use wands).