Amen. It's stupid on so many levels. But it seems like something GRRM world come up with. I guess with the right setup and framing it might work? But it's probably been forever ruined by D&D's idiotic execution of it.
Simulated universe theory removes so much agency and meaning from life.
But we're to the point now where were beginning to simulate universes of our own, and when you read about these things creating thousands and thousands of instances and spool that out into the future it's pure hubris to think we live in the one true universe.
Also the whole speed of light relativity threshold thing is obviously just a render gate.