Disagree. All the warnings suggest rider error. I suspect that if they published, "We've determined that, on average, approximately once every N miles, a onewheel is likely to briefly fail to deliver power to its motor, throwing its rider at whatever speed it's moving," they would sell far fewer of these items.
Yeah but that’s not the case. You see a lot of the injuries because people on Reddit and YouTube and discord like to show them off, but in grand scheme of things most of these riders will tell you they were being idiots (like riding drunk at night, pushing 30 down a hill, trying to hop curbs at speed, ignoring pushback, etc), and many hop back on their board as soon as they can. The few that weren’t being idiots, well a fraction were lousy or inattentive riders and some fraction suffered a failure. What you’re not seeing is all the riders and boards with zero problems.