Yes, that's what I mean. You could easily include any type of self-propelled vehicle (and have a weight limit if you want so it's any lightweight self-propelled vehicle) but it wouldn't be easy to only include escooters without any other type of vehicle.
I'd say the real issue is that EAPC's (eBikes) where bodged in the law and actually they could have simplified things hugely by creating a new class (as per the linked motorcycle categories above) that is electrically powered, <250W, <15.5mph and even add a weight/size restriction, i.e. < 30kg and a max of 2 wheel inline with a width of < 50cm..
State you need no licence, insurance or registration for that class with a minimum age of 14 and must comply with all rules that apply to cycles..
As mentioned, other countries manage to be far more forward looking and promoting smaller, cleaner transport, we are being so backwards.. Just look at our EV handling in general..