This made me chuckle. So being in almost full heroic(non-wf) BiS means there's no ability that can even remotely one-shot you? How weird!
As I understand the argument it's that BECAUSE bears have no way of reducing physical damage nukes they band-aid buffed both barkskin (from 60 to 30sec cd) and the stamina modifier on bearform (was 1.2, is now 1.4). Specifically mentioned was G.Nazgrim's 'Execute', which isnt reduced by armor. That being said, im almost sure no physical nukes are modified by armor, only boss-autoattack damage. Otherwise the 3m damage execute would be reduced by both tankpassives (10-25% dep. on class) + 'stance'passive (blood pres. etc) which arent encompassed by the other passive + armor (55%-75% ish). Would not be much left of that 3m after those reductions.