These are multipliers. First, the QA left, but nothing major happened for years, automated tests did suffice. Then, vibe code happened, that with the lack of QA

These are multipliers. First, the QA left, but nothing major happened for years, automated tests did suffice. Then, vibe code happened, that with the lack of QA, led to disaster. I doubt "studies" exist and proving every little assumption takes too much effort as per Brandolini's law.