It will be difficult to endorce/regulate a law like that, but But in Europe is already being done,
Well with a Pas can adjust the level of battery usage. Cruise control would have been a lot better, that and throttle for fast acceleration from stops should be first 2optionS.
With both can also pedal like you said and with cruise control can also keep the battery usage in control. Say CC @20mph would have been PAS LEVEL 2.
Important is for the pedals to be there ? no matter how slow or more important, how fast the ebike goes. W/o pedals they will say is a motorcycle. And then can pedal once in a blue moon/ when exercise is needed or when not tired. Ia just basic common sense.