So there's a way on a diesel truck to bypass the exhaust recycler. It increases your mileage and some would say makes your engine run better but it's also against the rules of the EPA/DOT in the United States.
If you are caught driving a rig that you've bypassed your exhaust recycler you will get a ticket. You chose to do something for personal gain that was against the law. It's not the truck manufacturers fault, it's yours for doing the bypass.
So please, tell me more how this was Blizz not following through with their QA as opposed to people finding a way around a mechanic that they knew was a bug then using that bug to clear the content.
Just because someone leaves $5 on their desk doesn't mean it's their fault if I take it.