If people wanted to wear a phone screen taped over their eyes out in public, the technical limitations wouldn't barely make a dent in that desire. But the vast majority of people want to have real in-person human interactions when they're out in the world. That's what the makers of these devices fail to see. But they can't see that because they're self-described VR enthusiasts. If they talk to non VR enthusiasts (which is everyone else), they'll see that the limiting factor isn't the hardware.
Think of it this way. Most people think it's rude to talk to each other indoors with sunglasses on. That's the slimmest form factor you're going to get, and it still steps on the toes of human connection.