I mean most videogames have dropped spit screen multiplayer from their featureset for years. Still a few holdouts I think.. mariocart/marioparty/smashbros I imagine .. though haven't tested all of those on the switch, i know kart at least still has ssmp and of course party.
So that couch co-op/battle situation is already rarer than it used to be, and the games that support it skew younger or are indy (lovers in a dangerous spacetime, etc)
Online multiplayer with each player having their own screen is much more popular these days it seems.
I certainly spent a lot of time playing couch co-op when I was a much younger man (nintendo64/playstation/saturn/xbox era and before .. let's here it for MULE on the c64) but that kind of gameplay seems to be fading with a few exceptions.
I have played some AR boardgame prototypes using the quest 3 and during the pandemic experimented with playing boardgames with friends in tabletop simulator, experimenting a few times with using my vr headset. They are still compelling situations.
In the case of the AR prototype, that was a shared space. Four of us in a room with our own quests but all observing a shared table that contained essentially a boardgame.
In the case of my pandemic online boardgaming, the presence of others is basically experienced the same as any multiplayer game where you might be on voice chat with the other players. VR or not.
I think the AR focus of the vision pro and the quest 3 might change this view you have a bit around many people in a room all with their 'own screen' but able to see 'through it' and put eyes on their opponents physical forms.