Generally people use "walkable" to mean that errands can be done without a car. I presume the people in these suburbs are using a car to get their groceries.
> Not everything has to be centered around consumption/consumerism
If you're arguing for a completely non-consumptive lifestyle in which you grow/forage all of your own necessities, then I concede that my argument doesn't apply to you, but I think most suburb-dwellers are not at your level. Suburbs are typically much more resource-intensive to maintain than denser neighborhoods.
Suburban neighborhoods are clearly less resource intensive since they don’t have a high density population to maintain with equally high levels of consumption
