Does it make sense to have an actual metaverse, a common 3D world with the same mechanics for everybody? I would imagine that different parts of the metaverse

Does it make sense to have an actual metaverse, a common 3D world with the same mechanics for everybody? I would imagine that different parts of the metaverse would have different rules and mechanics, because they're used for different purposes - various games, workplaces, software, etc. And if so - don't we already have that with the internet, reddit, social networks, steam, and MMORPGS? I would imagine that metaverse as described by scifi authors would have to have some kind of central location with various portals leading to various parts of the world. But I think there's a good chance that what we have now - internet, steam allowing you to download games, and multiplayer games themselves providing various subspaces - might be simpler, more convenient, and more flexible than one unified 3D world. Hundreds of games already provide their own game unique mechanics, and social networks and reddit already provide unified game mechanics for reputation scores and such. If we really want the whole thing to exist in VR - maybe there could be a VR "browser" creating a 3D interface for searching and navigating various parts of the metaverse. But the parts themselves would be built by different teams/companies using their own game engines and rules. That version seems more flexible and realistic to me.