

The second dumbest engineering idea. The dumbest was clearly the car itself, letting the average person control a device that can accelerate hundreds or thousands of kilograms to speeds where reaction times of fractions of a second matter for safety was clearly one of the stupidest ideas ever.
It is not as if buttons required in cars differ wildly between models, they could easily mass produce those too if they wanted to and if cost is such a major concern maybe getting rid of the stupid design team that makes them look different for every model would save a lot more money.