The whole idea, that you can save costs, by have a "fit-it-all" design, is flawed! Take multiple different customers for a car, one wants to have a sports-car,

The whole idea, that you can save costs, by have a "fit-it-all" design, is flawed! Take multiple different customers for a car, one wants to have a sports-car, one a pick-up and the third, something that can dive ... What does not work in car-design, does even less in jet-design.