If they're going to make people ride bikes and scooters in traffic, then it should at LEAST be legal to do the Snow Crash thing where you use a hook-shot-style harpoon to catch free rides from cars.
Physical condition is still relevant. If nothing else, being lighter extends your battery range. I have a couple of E-bikes. My 230lb/104.3kg ass can only manage to extend the range of the bikes to about 30 miles per charge, without pedaling. My friend's daughter who is more like 105lbs/47.6kg, gets almost 50 miles per charge, without pedaling.
St. Petesburg is flat, but it doesn't have a lot of bikes. Moscow is hilly(and called city on 7 hills) and has more bikes. Sooooo, extrapolating US should be better for bikes than Netherlands.
Changing urbanism culture doesn't mean that everywhere needs to be exactly like the Netherlands, if a place is too hilly there are still better solutions than car-centrism.