There is something different that happens in a vertically integrated engineering firms. In the event of a critical defect - very senior engineers will find out the specific people who caused the defect, and vet that the appropriate corrective actions have taken place. Likewise, if you do your job well on sub-assembly 529ca - you have the opportunity to be noticed and move up to bigger projects without changing firms. These records are persistent in the company, and it can be highly embarrassing and impactful to have caused the issue many years later.

When you've outsourced the supply chain, personal responsibility is washed in a sea of lawyers, managers, buyers, and other personnel - the incentive to do your job to the 80-90% of completion and no more is extremely strong as it makes everything look better over the next 2-3 years.