It's not that VR can't be social, or that you can't spectate it. But it takes effort. Unless you actively recruit someone into a party game like Keep Talking and Nobody Explodes, you slip into a strange alone-together state. One of you can only see what the other is doing through a mirrored TV feed, which can be surprisingly difficult to follow, since it's just a flat cutout of the player's larger field of vision — often swinging wildly as they move their head. And the other can't tell if anyone is there at all.