Gee, I thought that was the purpose of rear view mirrors.
Rear view mirrors only allow you to see something maybe 15 or 20 feet behind your car unless it’s as tall as your trunk deck. These let you see something the size of a baseball on the ground immediately behind your car.
I love the cameras themselves. Not being able to decide whether to buy one or not and my fellow Americans not being able to decide either, not so much.
I was under the same impression.