It's strange that regulations in the US prohibit even things like aspherical/convex mirrors for safety reasons (the reflected image is deformed), or active headlights but deforming the steering wheel and making it less intuitive to control in emergency situations for the average driver is accepted.

The wheel not only has less physical room for the drivers to place their hands, it also presents one missing side and a constantly changing grip angle depending on the position of the wheel, requiring a lot of shuffling of hand.

In Europe there's also no prescription for the shape of the steering wheel so one could sell a car with a trackpad for steering.