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If this is true, why do cities built precar work?A partial answer is that they have used zoning to externalize many of the services and production needed by the area built pre-car to areas built post-car. You don't have rocket factories in downtown Montreal precisely because zoning has created a more effective area for them somewhere else.
But most of your food, energy, and all things you use, all the physical goods come from somewhere else. And if people are like here, they whine about the transport of food to their local store when it's done by a van or something because they don't want vans, they just want food.
Anyway, it's telling that in many cities, some of the most desirable areas couldn't be built today due to construction and other codes. Not just parking, but also things like fire safety, energy efficiency and access for disabled people. Over here (Helsinki region), tiny downtown apartments are very fashionable but building them is absolute no-no, because
1) in an attempt to increase quality of housing stock, its forbidden to build apartments smaller than 20 m2, and a certain proportion must be over 75 m2 (or whatever, depends on zoning area)
2) in an attempt to give better access to handicapped people, every apartment must have a bathroom with floor space big enough to dance a waltz in a wheelchair; likewise, access only via stairs (typical in old, fashionable and popular sites) is not allowed
3) ratios of window form factor and apartment depth are specified in code
4) every apartment needs to provide bomb shelter capacity for residents
5) for fire safety, it must be possible to drive up a fire truck with ladder/crane and lift out any people from every apartment via windows/balconies
6) modern energy saving and health requirements mandate electronically guided ventilation which makes re-construction of "old" style houses unfeasible
etc.
The parking norms get most attention, because cars are a convenient target, but there are also many other things that are simply making old-style neighbourhoods impossible.