My onewheel HAS nosedived before, due to rider error. My board has almost nearly always given me a heads up in its operating characteristics or by the built-in warnings (beeper + pushback on the newer model, pushback on the older model. Every time the board had an issue it was due to an error I made, not the board.
This product is as unsafe as an electric unicycle. Why is there no opinion on them? What about if my electric skateboard runs over a bump too big and I go flying?
Grow the fuck up.