@RS-60 mark, what should an owner of a component car do when the manufacturer goes out of business? How about when they don’t have said part in stock?
Under your premise, there would be no independent auto repair or parts shops. Should we all just go to the dealer?
This is a real problem in the hot rod world, where parts from all different makes and models are used. This is why it is becoming more common to keep logs to go with the car when completed.
When I buy a product, I expect a level of support from that company. That is part of the price paid.