Note that the commenter said rural rather than suburban, and that's a really whole other can of worms, but on the other hand they aren't as frustrating to have cars. The population density is so low and the distances so large, it's hard to figure any thing other than cars to meet those needs.

But I'm in suburbia, in fact right next to one of my cities mixed use mandate (all new housing must be dense housing and must construct retail space and office space with any housing construction). They also have very little parking for the retail space. So what has happened with those projects? The housing has filled up, but no company wants the retail space. A company could choose to open up a store there to serve that community and not much else owing to tiny parking, or they can set up 5 miles away for not much more and serve dozens of communities.

There was one successful mixed use development, but they were massive and dedicated a huge amount to multiple parking decks. People pay a lot of money to live there and it is walkable distance wise, but it's car centric and unfortunately would have failed without accommodating cars.

Best walkable experience I've had was a place with trams and pedestrian bridges, as well as roads and parking decks. Businesses could count on the reach afforded by accommodating cars, and pedestrians never had to step on a car road or suffer a bus stuck in traffic. However, it was a massively expensive place to be.