This is so obvious. Of course Blizzard are trying to claim it’s because of gameplay reasons. But that is BS.
Ion said himself in an interview that the server lag is mainly caused by all the random procs in the game especially in AOE situations. So what is the easiest and most lazy solution to fix this?.. an AOE HARD-cap.
If it was for gameplay reasons as Blizzard claims then they could easily have made an AOE soft-cap. But a soft-cap would not have reduced the random procs and therefore they are making hard-cap. It’s so obviously just a lazy solution to a problem that Blizzard have created themselves by making the gameplay of WoW based on a million random procs.