I have watched closely on my commute every day how people use these (SF/Mountain View, etc), and I am stunned at how close to disaster some people are. They pu

I have watched closely on my commute every day how people use these (SF/Mountain View, etc), and I am stunned at how close to disaster some people are. They put their hands deep in their pockets with the controller, don't wear helmets, have precarious backpacks that change their balance, etc. You are one larger-than-expected crack in the road from being thrown off the wheel under a bus. At one point I rode scooters to work, but after one such incident (fairly benign but I could see where it was headed) I swore off anything so unstable.