Saves gas not time and then you have to still go inside a building for the purpose of obtaining an object. Weird. I go into buildings to meet people. To go into them to get objects, do we need to do that now still?
I mostly bike and walk everywhere, a bit of train. Walmart is just so, well, awkwardly placed far away, and serves an idea which is no longer valid (own a car, drive a car, have a home which can keep a car nearby, etc).