What does this sub consider walkable or not suburban?

A running theme I see with especially the larger southern cities is the perceived lack of "walkable" neighborhoods or lack of public transportation which as someone who lived in downtown Houston and East Atlanta makes no sense to me.

If you live in the urban cores of Houston, Atlanta, Dallas, Charlotte or Nashville you can get a similar urban experience you can get in any city save the Bos-Wash corridor.

Maybe I'm misunderstanding what walkable means. In Houston you can live by the light rail and get to all the stuff downtown and to a lot of the north and part of the south which covers an insane amount of restaurants, an aquarium, 4 pro sports teams, a museum district. Also the galleria and all the things around it. In Atlanta the Marta goes through the entire core and almost every neighborhood within 2 miles of downtown is extremely walkable. There is again monuments, an aquarium, museums, an underground mall, pro sports AND college sports etc...also you have Buckhead which is another extremely walkable area at least the part near downtown. Dallas same thing but add a farmers market and they also have uptown and deep Ellum other walkable areas.

Charlotte and Nashville not quite as vibrant as these 3 but same concept. If you live near the core there you still get an urban experience that's just as good as 90 percent of the country. Now if you move to the parts away from the core and complain about traffic you're part of the problem.

Also all of these places have doctors offices and grocery options within the core too as mentioned before Dallas even has a farmers market downtown.

Also maybe I'm confused by what people mean by walkable?