Do we know for a fact it is not functioning? I have "sort-of" tested it and I have had a total of 4 Model S vehicles. This weekend, my car still "saw" in the dark, a vehicle that had no lights on. It showed up on the top of my display at ~300-600 ft, not sure exactly, but was similar as with my older cars. If the vision only can see that well through snow, rain, etc then it should not matter, but seems bad to disable proven tech without a replacement being ready, ie Ultrasonics. If they are adding high def radar, they clearly KNOW radar is needed... Also, when I go into my service menu it still shows radar as being active/functioning to the car. Also, my ultrasonics still work...