I haven't personally seen a Onewheel crash, but someone did pass me on my (non-electric) bike with a powered skateboard the other day, and not 10m past, one of

I haven't personally seen a Onewheel crash, but someone did pass me on my (non-electric) bike with a powered skateboard the other day, and not 10m past, one of the wheels dug into a pavement defect, board stopped, he didn't. Low-ish speed, got away with some scrapes and a bruised ego, but no bones broken. The fact with these things is, you don't have leverage to stop. On a bike with proper posture, your center of mass is a fair way behind the contact patch of the front wheel and you can brake hard to the point of wheels skidding and not nosedive. Though a front wheel motor hypothetically going from full power to sudden lockup probably would send you over the handlebars. Someone passed me on an e-scooter with 6" wheels, going at least 40km/h (I was going about 30km/h and the passing speed was significant). Disaster waiting to happen.