Reversing often disturbs the usual driving pattern – typically reversing against the direction of traffic, into a trafficked road, or in areas with pedestrians. You also have poor visibility when reversing. Therefore, reversing should be avoided if possible.

In regards to the other alternatives:

The driver is always responsible for the reversing (and may never pass this responsibility on to someone else).

Always use mirrors, not only when reversing.

There are no regulations requiring new cars to be equipped with a reversing camera. There are no regulations requiring new cars to be equipped with a reversing camera.