[Gravityloss]

I'm not sure, are you saying that cars promote diversity and prevent food deserts?

I find the opposite to be true. If there are lots of people walking, there will be lots of walkable services and businesses, so you tend to have a lot of choice.

Ownership of houses is usually diverse in dense walkable cities so it's really easy to just rent space at the ground floor to start a business. If you don't like it, move across the street.

Compare this to car cities. People drive their cars to malls. Malls are very much rent seeking. I've heard that they constantly increase rents of the shops so there would be churn - new shops to "keep it interesting" for the visitors.