I agree with your post in theory, but I think that the sticking point is the enforcement. E-bikes aren’t registered and an e-bike license does not exist. Having enforcement hasn’t really stopped speeding of motor vehicles either. Law enforcement chasing someone down on a bike lane or path would endanger others as well.
I wish that I had the perfect solution, but I don’t think that it exists. Many will disagree, but I think that the current regulations are a good start and seem reasonable.
I ride a class 1, and on the rare occasion that I use a rail trail or bicycle infrastructure I follow the rules. On the road, (gravel, dirt or tarmac), I obey the posted speed limit, but no one should think of a class 1 as slow. I often reach speeds over 40 mph and tend to ride the flats in the low 20s.