It might have been an exaggeration, but on a certain level responsibility means large amount of pay if you mess up.
https://www.theguardian.com/business/2020/jan/09/boeing-737-...
Managers aren't paid because their abilities, they are paid for responsibility. In any case it should be QA on the line.
Also, hiring for legit QA, as in, you're getting people who can socially stand up and trade blows with engineers and management is hard. You have to have that unique blend of perseverance, quick thinking and attention to detail that is astonishingly hard to find.
It's probably not as simple as you put it, then someone would've done something about it. (Assuming this system wasn't built by a very small engineering team, then they could statistically all be "bad" people).
Note: for me MCAS isn't a problem per se. It would have been better to have a new design from scratch, but that's a whole other issue. Lying about it(chances of failure, risk when it fails), hiding it, and to top it off using a single sensor that is known for occasional failure. And making it near impossible to override even when the pilots knew about it ( which they didn't, thanks to Boeing hiding it from them). That's criminal negligence by tens if not hundreds of people every step along the way. Every single one of them should be tried and have to explain why their manager's or their bonus matters more than human lives.
It's an organizational/economical problem.
I would like to argue that because recertification requirements are as strict as they are, Boeing were forced to do this to get their product flying.
I don't condone Boeings behavior, but it's not hard to imagine why it happened, and it's definitely not the engineers fault. It's just capitalism in action.
It really comes down to failure to cooperate with the regulator. Perception management is often times easier than proactive compliance. I keep dreaming one day I'll end up somewhere where I can get more than platitudes when people say "we're here to do it right, even if it is hard".
One day...
So I guess not and this is the reason why they made the deal.