>some killer feature here no one understands about the metaverse?

Yes and no. Theres a lot of confusion and misdirection when it comes to the Metaverse. And there are still lots of technology shortcomings.

The best description I have seen is that the Metaverse is the internet, but designed for new human interfaces: namely augmented reality and virtual reality. Much like the internet this is more about a set of widely adopted protocols, technologies and standards.

Also it still doesn't exist yet. Things like VRchat do not provide open standards or interoperability.