I'm not an expert, but am not
I'm not an expert, but am not surprised at this. Musk goes where the facts lead. Radar might be very helpful for specific, limited use cases - like seeing thru the car in front, to see if another car is braking too fast. Using it in a limited way like this would seem to lessen the "redundancy" issue and extra complexity; radar could be ignored, most of the time, but still increase safety.