You are still just arbitrarily limiting what is possible to current human understanding. I find it extremely unlikely that the understanding we have of nature

You are still just arbitrarily limiting what is possible to current human understanding. I find it extremely unlikely that the understanding we have of nature at this arbitrary point billions of years into the universe's development and ~10k into our development just happens to be the exact point where we have a clear understanding of the fundamental nature of reality and what is possible. The other problem is that if this were a simulation, quantum mechanics might not be a fundamental mechanism of reality but rather arbitrary rules executed by the simulation.