Wow. I guess I’m really old and remember the days of using the rear view and side mirrors to back up.
They reckon the mandatory backup camera law saves 95 lives a year.
Some cars do have remote-control drive features these days, so you can reverse it from outside the car, but that's a super high-end feature (designed for getting in to and out of extremely tight city parking spaces) and relies on the chips that are in shortage, so that's not a solution.
They don't make laws to force cars to add features for convenience.