Does the itemization example really help your case though, considering it's intentionally limited to two, maaaaybe three pieces per slot per raid cycle maximum? OP's suggestion for cross-classable traits reminds me of one of the oft-repeated requests for "unique/skill-modifying stats on gear", and despite making regular appearances on the forums since ARR's release, notice that feature hasn't been implemented either, again likely because it'd be too difficult to balance properly.

I want to be clear, I'm not against the idea by any means, nor the one in my post, I just question the feasibility of their being added to the game.