Thing is it's way more important for the lvl 60 to 69 area where your total armor as a tank skyrocket, they nerfed that for shadowbringer and i'm pretty sure that's because of ppl like the op.
If you take the crafted body ilvl 265 HQ item lvl 62 you get 478 armor and magic defense which is roughly the lvl 270 60 blue gear you get with tomestomes.
If you look at the ilvl 285 which is only 20 more ilvl and lvl 68 HQ body you get : 804/804, it's almost the double and that's only 6 level appart from each other.
That was the big problem and why everyone said he was undergeared, armor for tank at this level is needed more than anywhere else, and that's why he got melted with his ilvl 270 gear.
Plus what he said about using CDs after he already got hit and taking full damage, no wonder it was a disaster.