No argument. Which is why a lot of cities (rightfully) pushed back on Segway's lobbying. Fundamentally you don't want stuff that goes faster than a walking pace on a sidewalk. Of course, the main reason that people might want scooters, bikes, Segways, etc. is that they are faster than walking. Assuming you're capable of walking, an electric device that can't go faster than 3 or 4 mph isn't very interesting.
Unless you specifically want to spell out that devices called segways are allowed and anything else isn't.