> Until then, it's at the expense of general mobility which is a really big downside in cities that are already crowded and transport is slow.
Automobiles are the sole reason why general mobility is so poor in cities that are crowded (with cars) and where transport is slow (due to cars).
Please take a look at cities in Denmark or The Netherlands. Cycling is the primary mode of transportation in their city centers. Not only is it cheap, reliable, healthy and it doesn't take up much space... it's also _faster_ than driving a car.
Yes, cars are practical for rural and long-distance travel, but not for use in city centers.