They also already have that computer and most of them have the sensors too. The reason so many cars come with lots of these features is that the base electronic

They also already have that computer and most of them have the sensors too. The reason so many cars come with lots of these features is that the base electronic package that the maker uses just comes with it, so the R&D is already paid for and removing it would be more labor than the components cost. After all, it’s a $5 radar, a $3 chip, a $1 camera, and $0.02 of wiring.