>Approachability is not a feature here. This is powered vehicles we're talking about: a danger to both the rider and pedestrians. They should observe regulations for powered vehicles, period. If they are not safe, they should be banned. If they do not fit any regulated category, they should be banned.

They are far more safe than cars, and hence they should remain allowed until cars are banned.

>There is a reason arbitrary unregistered contraptions are not allowed to roam city streets.

Registration does nothing with regards to safety.