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I realize that they'll probably need to DW to use tanking weapons, but it feels wrong for DKs to DW
You just don't want DKs stealing your loot ;)
I agree personally that DKs should use big, nasty 2H weapons as a point of lore, feel and image. However, in terms of gameplay mechanics they quite simply require a steadier threat generation curve. a 2H weapon leaves too much up to chance, and too many windows for an over-eager caster to crit past the tank while he waits for his on-next-hit Frost Strike to land.
Itemisation I dont see being a problem, if Blizzard wanted to add 2H tank weapons that'd be easy. The problem is simply the mechanics, it's better to have two quick weapons than one slow one.