I think the subtext of the FMVSS stuff is that the comma one is thought to be replacing the rear view mirror on the car, which is apparently illegal in some states and also prohibited by regulation in cars shipping in the US.
I find it hard to believe that anyone of reasonable intelligence, certainly someone intelligent enough to work on self-driving car tech, could miss something so incredibly obvious.
Modifying a car is one thing but directly interfering with parts critical to safety?
