oneyplays works because they are all long-time friends with histories of being internet funnymen with their own lives and projects. The content itself is low effort, but their natural charisma and chemistry makes it enjoyable.
The concept doesn't properly translate over to vtubing because of the cost of getting a model means that a full group of vtubers would have too much sunk cost. There's be pressure to stay together, pressure to censor themselves, reasons for drama to boil up, etc.
