Quote Originally Posted by SaitoHikari View Post
The explanation I heard was that they did test A3S and A4S, but not thoroughly. Like they tested each phase separately, so the testers were going into each phase with all of their cooldowns available, which is why some of the A3S DPS checks were really really absurd in a real environment.
Pretty much this. Quite the amusing oversight, it did make for a mostly good raid tier though!