Xreal Inc.’s new One Pro augmented reality glasses are a taste of the future, giving a preview of what devices from Meta Platforms Inc., Apple Inc. and Alphabet Inc.’s Google may feel like.The impressive new glasses resemble normal spectacles from a distance. They’re discreet and comfortable to wear. But they’re not an example of true, standalone AR glasses that blend digital content with the real world while also supplanting a phone. Instead, they excel at one important feature: plugging into s...