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Nobody made a rule that says cars can't have cameras in more than one location.

When moving, cars can compare hundreds of different viewpoints. Multiple cameras provide for depth perception when stationary.

it’s too bad that cars can’t move to get additional points of view.

Not like a human can, actually. Fixed cameras are fixed relative to the bodywork, necks are not. OTOH, if I move my head it's usually to get around a blind spot, something cameras have less of an issue with.