For years, Walmart was widely viewed as the less luxurious, more affordable option among major retailers. It was where low prices often came with a no-frills atmosphere and the occasional odd encounter that made the chain feel a step below its competitors. That perception, however, is steadily changing. In recent years, Walmart has invested heavily in store upgrades to shed its once less-than-pristine reputation. Its latest move seeks to further elevate the shopping experience by turning everyday errand ...