People who aren't qualified for the job will cut corners in order to try to keep up with others in the same position or to keep up the metrics compared to the people they replaced. This usually causes problems down-the-line because problems created up the line effect everything downstream. If you also replace the people down-the-line with less qualified people, not only are they making their own mistakes, but they're being forced to make even more mistakes because of the poor quality of incoming parts or managerial decisions and it compounds. The more you replace your workforce with unqualified people, especially in management which is upstream of everything, the problems you'll have grow exponentially.

All of that can be summed up with "It's because of DEI".

No one in our mccarthyist anti white society will ever admit that. They will just pretend the problem is some behavioral thing that can be changed easily and suddenly all the problems will go away. When a house infested with termites start collapsing you can't just replace a couple of beams that broke and claim that the problem is fixed. In this case, parts being manufactured out of spec and then being used on the airplanes are both symptoms of the problem, not the problem itself. You don't get failure is piling up like that for no reason. Even if you find effective policies to prevent people from cutting corners in these ways, those same people will find ways to cut corners somewhere else, and those behaviors will cause other beams to break.