Even if it's entirely deterministic above the quantum/micro level, that doesn't mean we can predict anything without computing the entire future world, just lik

Even if it's entirely deterministic above the quantum/micro level, that doesn't mean we can predict anything without computing the entire future world, just like in the game of life. Also, the wavefunction is deterministic, so you could in principle compute the many worlds, but that wouldn't tell us which one we will observe.