It just comes down to whether a time-of-flight ranging sensor is really needed for an accurate depth map/point cloud, or depth-from-vision (i.e. ConvNets) has gotten good enough that adding ranging sensors is just superfluous data. Depth from vision isn't always the most accurate, sometimes it can produce crazy results. Front-facing vision on Teslas with the radar fused in always seem to have rock solid depth predictions, I never see front cars bouncing around or anything. I don't think adding front-facing LIDAR would help Tesla's case. On the other hand, with the side-facing repeater cameras that are purely vision from single cam, there are many cases where the depth prediction goes nuts. Like if vehicles fill the entire camera frame and edges are occluded, the confidence of the vision system goes way down. Maybe there's an argument to be made for adding rear and/or side radar, or maybe future releases will improve the vision performance for side/rear cams with a better model.