This of course, is a discussion/debate that could go on and on, and although I fully respect your opinion - and would encourage you to operate your UAV as you have and are used to - here is my issue with 'Obstacle Avoidance Sensors'.
Traditional aviation has always adhered to what I will refer to as the '200% factor'. A simple example of this would be a propeller for let's say a Cessna 172 aircraft. The manufacturer tests this propeller under normal expected use and concludes that it would function serviceably for 4000 hours prior to exhibiting failure or possible failure of any kind. They would then recommend that said propeller be replaced with a new or overhauled unit at 2000 hours. In fact, the FAA would require this replacement for aircraft operated commercially - and they do.
The problem with UAV OA as it stands today - on what are indeed aircraft - is that its reliability factor is very much lower than 100%. As such, its current state of technology - at least as implemented on DJI drones - would not be good enough to meet the traditional aviation use standard, and again, these are aircraft that have a potential to injure people or worse if crashed.
Then there is the problem of a pilot's false sense of security with OA. Feeling secure with a system that has a much less than 100% reliability record is never a good thing. I would argue that not trusting or using the OA system causes one to be a more cautious and vastly more aware pilot, resulting in not putting the aircraft in a position where OA - if it indeed worked reliably - would be relied on to protect the aircraft from damage and humans from possible injury in the first place.