No this doesn't happen to a large degree. The examples you cite are where existing tooling is used to manufacture a complete product. The Mazda/Ford owned asse

No this doesn't happen to a large degree. The examples you cite are where existing tooling is used to manufacture a complete product. The Mazda/Ford owned assembly line can be set up for either product. There are crazy hard barriers standing in front of fabless car companies, with little benefit. Who wants to buy a car from a manufacturer with no support? Will the suppliers guarantee parts for 20 years? Or do you want to contribute to landfill problems and tell me to just get a new one?