oh another issue was probably that there was too much raid-testing this time. Almost all heroic bosses got tested twice, 10/11Mythic, 10/11 normal and 10/11lfr all got tested. We saw every phase on every encounter, there was nothing unknown about any of the fights, only that they removed soulbomb in argus p4 which made it even easier.
I actually liked it when ptr tests used to be overtuned so you wouldn't get to see everything, it kept some secrets, but antorus testing was a joke already.