While I do understand the hunters calling for an Agility polearm, note that you were given the final legendary (Bow) of Burning Crusade, while the most previous multi-tank legendary was Thunderfury at 60. That said, I think it's fair to assume that the next legendary in sequence should be a tanking item of some kind. Whether it is restricted to shield-wearers or something that every tank could use, I personally don't see an Agility weapon taking priority.