Re: "together even when they are physically apart"
>If I want to be with someone, then I am with someone. ...
In the current lockdown, you can only do this (and some of the other things you list) with someone who is a member of your immediate household...
I did a variation of what the BBC is offering (same time different place) with a movie for my teenage daughter's birthday recently, she and her friends watched the same film, whilst in a 'meeting' (*), so whilst not as good as being in the same place at the same time, did permit some real-time interaction and viewing control (pause, rewind).
(*) Need to be careful about sound feedback. I would hope that someone will implement some form of noise-canceling (on the movie) which would enhance the meeting experience ie. would permit audio/spoken word conversation.
>Still, the Beeb idea is bizarre.
Given the omission in your comment, I suspect you also don't see the point of multi-player gaming and in game chat - something my teenage son does a lot with his friends.