It is indeed. Cities are extremely diverse. But the majority of persons in the USA live in metro areas, and there is no simple method of providing power or billing for vehicle charging in all those locations. If it's an extension cord run out a window, that's quickly going to become a zoning issue. Actual physical chargers are not only more expensive to install, but fail often. I'm not even addressing the lack of generation and distribution capacity, because that's even more complex.