You don’t need a week to see the obvious. He’s a mid tier boss whose objectively harder than the bosses after him and he’s gatekeeping critical pieces of gear he’s supposedly balanced around having to begin with. He’s even harder than the first set of bosses on heroic even and he isn’t easy in a way that double leggos are just going to magically solve.
Normal is literally designed to be done by the majority. Blizzard themselves said it is friends and family/beer league difficulty level. Nobody is asking Anduin to just stand there and auto attack us while maybe chucking a divine star blindfolded once every 10 minutes. Save that level of ease for LFR.
Blasphemy needs to, instead of doing damage for failing, stun them for a few seconds. It also needs to clearly pick the targets it is going to make do the mechanic and leave everyone else without an aura so the people who get it all know and can see who each other are in those first few seconds. This would also allow the strat to handle it simply be folks with auras move to a set location and everyone else on opposite side. I’ve lost count now the number of times I’ve seen a lone pair on opposite sides scrambling to find each other followed by both eating the floor after.
It needs to not have the debuff when going to the shadow realm. Let beer league players set a dedicated team to handle it while the left of bell curve ones stay on top.
The barrier shouldn’t be cast while a group is in the shadow realm for normal. There should be 2 fear adds max on normal.