You just happened to be located close to it. It's still designed to accommodate people coming in with their cars. Unless it's a different kind of Walmart, there is usually a huge parking lot, and entry on foot is a bit cumbersome sometimes.
I don't see how that rectifies the essential grievance. A Walmart ~ < 2 miles away is substantially similar to a Walmart 10 miles away for all intents and purposes. And, as I mentioned in my post, even if it were 0.25 mi away, there are all kinds of artifices in suburbia that commonly stop one walking there.
Do you walk to this Wal-Mart? I live one mile away from the closest grocery store and I still drive.