It's not even true at least not in the way it's depicted.
If we were indeed all the same same, then there would be no urge for individualism.
We might be made of similar things but ultimately we're not the same, one consciousness, only part of it.
Why would you need a whole universe of experience as different entities when you could experience everything solo?
Even programs/algorithms work alone for better efficiency.
https://en.wikipedia.org/wiki/Ultimate_fate_of_the_universe