It's an abstract concept that nobody is willing to pin down to specific requirements, only general principles. If you actually want a peak at what people are hyping just try vrchat. Prepare for massive culture whiplash, weird avatars, trolls, and things that are off putting to some like sexualized avatars and furries. And of course it's not for everyone and every application, that's corporate hype stupidity. Why do I still think there's something really important there? Cause there's something really special about all the small details. People who never would've met talking across thousands of miles "face to face." It's like our monkey brains process actual personal connection and bypass most the adversarial bullshit we've been cultivating in text social media.