I find Bezos' statement to be a bit oversimplified. For example Temu (and virtually every other Chinese E commerce) wipes the floor with price and selection. Costco is cheaper than Walmart. Yet Amazon is vastly larger than both.
Agreed. Without negative caveats, such positive statements are meaningless.
Customers want cheap goods.
Caveat: They don't want (to know that) those goods are produced by slave labour.
Customers want a vast selection.
Caveat: This should not include fake, shoddy or misleading listings
Customers want rapid delivery.
Caveat: And they want it cheaply, or ideally for free, without breaking their stuff, at times they are home or in a manner they can receive the goods while away from home.