And they don't own the real estate so that point isn't valid either. Not sure about trucking but would be surprised if they own their whole distribution network.
Last I knew (a few years ago) whole foods outsourced most of their logistics. They do have distribution centers but don't own the trucks nor related tech. In general this is a good thing, you don't want to run/own trucks unless you really have to, it's a very thin margin game that is easy to lose your shirt playing.
That's an interesting way to view it. Apple's incredible revenue/profit per sq.ft. statistic comes to mind. This isn't a real estate investment. They're buying capital to increase profits. But it's Amazon, so don't hold your breath.