Everyone has limited R&D and processing bandwidth. It's not just Andrej saying this, but anyone working on engineering autonomous vehicles. It has nothing to do with the cost of additional eyes. This is over-simplifying the problem. Our eyes don't work that way. The data coming from eyes and image sensors is very crude and relies on either your brain or very sophisticated post-sensor processing to construct a 3D approximation of the actual environment. The sensors themselves don't provide this information. They don't distinguish distinct objects, corners, shadows vs. changes in color, or all sorts of phenomena that doesn't actually exist in the sensor data. This has to be inferred later by a brain or processing that relies on prior assumptions and 'training' by previous experiences with 3D environments. I don't really care what Tesla is doing vs. what other companies are doing, but these 'cost cutting' arguments don't matter. I would suspect that the R&D invested into the Machine Learning infrastructure, and the custom IC, and the software engineering out-weighs whatever amount they could save by removing a small sensor. And I don't believe that this guy Andrej is conspiring to squeeze a few bucks out of his customers at the expense of degrading his life's work. He is not trying to sell mops.