Daggers are daggers. They're fast melee weapons. Maces/axes/swords/fist weapons are slow melee weapons. 2hands are 2hands, bows are bows. Daggers are in their own category, and it doesn't really matter, we have 3+ options of daggers each tier anyways. I guess if you really wanted to fell like you have a wealth of weapon type options Blizzard could call them Daggers, Quickblades and Shivs, but that's kind of useless.
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I complain a lot about how stale the class is, but the one thing I'd like back from the BC era is being able to use most weapons with most specs. Dagger combat or hemo swords.