That's why many cars include also a radar that detects and alerts you of approaching traffic from the sides before it comes into view - both camera and the driver (the blind spots when reversing are large).
E.g. Mazda 3 has that - if it detects a vehicle or even a pedestrian approaching from the side while reversing, it starts beeping and showing orange chevrons on the camera screen to alert me.
Obviously, this doesn't remove the need to look around and not rely only the sensors and cameras. The tech may fail and the ultimate responsibility is with the driver.
E.g. Mazda 3 has that - if it detects a vehicle or even a pedestrian approaching from the side while reversing, it starts beeping and showing orange chevrons on the camera screen to alert me.
Obviously, this doesn't remove the need to look around and not rely only the sensors and cameras. The tech may fail and the ultimate responsibility is with the driver.