[MichaelGG]

The additional cost is negligible. Current cars don't need placebo buttons because you can drive aggressively yourself.

Current cars do have placebos though. Some newer sports cars would play engine sounds thru the speakers to make users feel more power.

[HappyTypist]

Also electric cars by law are required to play engine sounds because they're so quiet otherwise

[PhasmaFelis]

Outside the cabin, to protect pedestrians. That's not a placebo.

[taneq]

That is so very Brave New World.