That may be true for the commercial sector. Switching contractors in NASA requires a LOT of paperwork and proving the new contractor can still build the same widgit to the same specifications. As a subcontractor, when we fail to meet specification, we don't get "Meet this or we switch vendors". What we hear is "Fix your processes and provide proof that this will never happen again." I imagine it's easier to demand a company to change their ways than to fully spin-up a new company to meet the stringent requirements. Because of the stringent requirements and amount of effort each widgit takes, we also take a lot of pride in those widgits. Each one feels like an accomplishment. We're pretty invested in the final product by the time it goes out the door. Launches are a celebration.