But why do you think it would make it easier? Power-steering doesn't mean there are sensors build in or more precise ones.

Your reddit comment references autonomes vehicle and in that case it shouldn't matter if the car also moves a steering wheel no one is using while it moves the wheels which is a lot heavier.

And in case of your nanny, the main argument of your referenced paper are issues with the hands of the driver. In that case it could make it better for the driver, I might agree, but I would then question how the driver acts if the wheel is suddenly / temporarily not aligned with the wheel. I might also argue that in such a case were my thumb gets in the way, it might be an emergency and i wouldn't worry then?