Except that's not what happened in English law, is it? First, there were people walking around and that was simple, then there were horses and they got restricted off of the smallest foot paths, then some people used horses to pull carriages and more rules were made for them, with the wider paths being formally classified as carriageways, then along come bicycles and nobody made rules for them at first, so it was left to the courts to try to figure out what to do with them and they decided to treat them basically like horses. Around the same time, locomotive engines were added to carriages without horses and parliament decided to make laws for them, partly because they were big and heavy and cutting up carriageways cornering too fast. Eventually the engines got small enough to add to bicycles and parliament decided to extend the locomotive rules to cover motorcycles.
Now we're in this mess because parliament didn't cater for low speed motors eventually getting small enough and light enough to fit to foot scooters. With hindsight, it seems obvious they would. Either way, this is parliament's mess for making short sighted rules and they should sort it out, or state that they're happy with motorised foot scooters being under the same rules as superbikes and give the regulators and police enough power and resources to deal with them.