Because the folks that ask this type of question are few and far between, and rarely serious. Otherwise, at least one manufacturer would have brown diesel wagons with manual transmissions. ;-)
Maybe 1 in 1000 people wrench on their own car. Manufacturers don't cater to that. They design cars to be appealing to the other 999, and they design the mechanical bits to be as cheap as possible to assemble in a factory.
Because the folks that ask this type of question are few and far between, and rarely serious. Otherwise, at least one manufacturer would have brown diesel wagons with manual transmissions. ;-)
Maybe 1 in 1000 people wrench on their own car. Manufacturers don't cater to that. They design cars to be appealing to the other 999, and they design the mechanical bits to be as cheap as possible to assemble in a factory.