Really? I think if we were to bring back our close ancestors (4-5 generations away) they'd look at our world like we see Harry Potter's: pure magic. I mean flying metal birds, fire that instantly turns on and off, machine that move around like ghosts, small boxes that can talk back, musicians on demand in a box? I think you get my point, you're selling humanity short. There's no limit to human ingenuity and there's a reason Elon Musk still doubts we're living in a simulation.

There's a massive difference between 'develop technologies which are indistinguishable from magic to people who don't know how they work' and 'completely simulate the informational complexity of the world using the human minds and computers with comparatively limited information processing capabilities.'

I'm not sure the second is even a logical possibility, never mind a practical one.

Dude, if you're referencing information theory you clearly don't understand how to create tech. Obviously they're not trying to simulate the universe accurately lol. Simulating the real world for specific use-cases to solve computer vision for practical applications is super interesting. If they have customers, makes sense.

That's assuming human minds and computers won't exponentially increase their processing capabilities. Moore's law disproves the later and I hope Neuralink or some other crazy tech company will disprove the former. That's pretty much the hope of all transhumanists.