Sooorrrtttt of. Honestly I can't remember the last time I got RNG'd to death, if it ever happened. If I died, it's because someone failed: either me or the healer (usually me :P). Either I didn't keep Shuffle up, or I didn't use EB at the right time, or I didn't Guard the Overwhelming Assault, or whatever.
Yeah, we're avoidance tanks, and there's always an element of RNG in there. But as I posted earlier, the chance of being properly RNG'd and having NOTHING you can do about it is super low. Really, REALLY low. my example was for the Dread Thrash on Sha of Fear, but it applies elsewhere too.
But hey, if you feel like you're getting RNG'd a lot, then there are ways to fix that. 2x stam trinkets, stam enchants, stam consumables. This will give you a much bigger buffer to survive against potential RNG problems. It also makes it more likely for those RNG moments to occur, and will mean you take more damage overall, but it gives the healers more time to react.
I'm just not sure if we're going to really need more buffs. I'm concerned that 5.2, as it is currently, will make us OP tanks. Being OP puts us on the radar for nerfs, and those are never fun.