I dont think its a very good analogy.

I completely understand dedicating space to public transport instead of cars. But dedicating space to cars seems entirely reasonable in isolation, because the city has an interest in making it possible to get there. Parking spaces store cars - but is that their entire function? Or is that just an aspect of enabling people to drive into the city?

Consider the fact that you cannot in fact store a freezer in a public parking space. Nor even a car, actually, beyond a certain period of time, precisely because it's all about enabling movement.