It’s been a very long time since Apple released a product as speculative and impractical as the Vision Pro, its $3499 first-generation “spatial computing” headset. Led by Apple, today’s technology industry sells billions and billions of dollars worth of technology to a grateful public that uses our smartphones, laptops, and other devices in nearly every aspect of our lives. It wasn’t always this way. When I was a kid, personal computers were just beginning to arrive in homes and schools. As I an...