The problem is that even with best intentions, as the system gets better, it takes increasingly more and more mental effort to keep alert. Google/Waymo and some independent studies confirmed it. Personally, I know better to pay attention, but a a few occasions in the past I found myself not paying as much attention as I should. On one occasion, after being stuck in stop and go traffic for almost an hour, once the traffic got going it caught me by surprise, I found myself staring out the side window and then had a sudden realization "wait, I think I'm supposed to be driving!" - that was before most of the nags. That, and catching the car a couple of times trying to drive into a broken down car on the side of a highway is when I decided to turn it off - I knew using it is just an accident waiting to happen, my biggest worry was actually exactly what eventually happened to the poor guy in the X in California. I also tell my wife not to use AP for the same reasons (and she's not a techie either, so she's likely to build up more trust in AP than I would). Maybe if the system was actually able to determine that the driver is not holding their hands on the wheel or paying attention to the road, maybe then I would start using it again, but then again, it loses a lot of its usefulness (to the driver, as it is of course useful to Tesla to have people beta-testing their stuff).