I don't understand why you are being down voted. I disagree with you that they provide quality though. They don't. It is also the case that the company that hires them provide any quality. All are in it for making money with lowest spend and quality that they can get by. Very few obsess over quality and ones that do are vertically integrated to control quality in each step of the process. Very few American companies are like this.
The engineers who complain here don't have any influence in the decision making or otherwise they wouldn't be crying and complaining here.
The engineers here need to understand the world doesn't function well if everyone waited for 100% quality before shipping something. Business trumps Engineering always. And I say this as an engineer myself.
The numbers don't matter, because they're not about the core issue at all. My guess is that the post reads as if you don't understand that money can in fact be spent wrong and you are downvoted for this reason.
The engineers who complain here don't have any influence in the decision making or otherwise they wouldn't be crying and complaining here.