Tank gives you more CC on pvp (wich is good for daggers to ham on some targets), in pve right now you dont really need it, but if 2.0 ever comes you will for sure want a tank in TOI.
Hhahahahhahaa, Vene told me just right after that pvp that Modoy pm him about this, hahaha i was sitting on his ass most of the fight then send him into mobs