You gear for what you need, mr Joe. If you are dieing a lot, you want survival stats. If you are losing threat, you want threat stats. Typically tanks carry a piece or two for every other slot so they can focus on whatever is more important on that pull.
And yeah, right now it's not doable getting a full threat set that also has a great survivability. If you check the BC history, only late t5 and t6 warriors made such a set.