This makes sense if the road is wide and fast, like in suburban cores: the point is to separate pedestrians from noisy, dangerous cars going upwards of 30 mph.
This makes no sense for local city traffic.
> in most cities it is unrealistic due to how little parking there is available
This is a problem with how American cities are designed. Ideally, one shouldn't need to own a car at all in a major city. In Manhattan, for example, it's ridiculous that the government (and therefore residents) subsidize cars by providing free street parking all over the island. Very, very few people who live there own a car. But I digress.
This makes no sense for local city traffic.
> in most cities it is unrealistic due to how little parking there is available
This is a problem with how American cities are designed. Ideally, one shouldn't need to own a car at all in a major city. In Manhattan, for example, it's ridiculous that the government (and therefore residents) subsidize cars by providing free street parking all over the island. Very, very few people who live there own a car. But I digress.