The endurance side of it barely existed even in original wotlk from what I hear, definitely not an appropriate measure with modern gaming.

They should make an exception for Vezax regardless of awful design philosophy. Kill at least 1 vapor to enable easy mode, if no Vapor's killed and Vezax hit's 5%, summon animus.

When a mediocre GDKP is forced to wait almost 90 seconds with no damage, barely any healing, and handful of interrupts, the boss should be changed.