A single human brain is far simpler and smaller than the billions of years of history and the trillions of non-human brains that you're suggesting be reproduced

A single human brain is far simpler and smaller than the billions of years of history and the trillions of non-human brains that you're suggesting be reproduced. The human brain did not evolve in isolation. It evolved to fill a niche that was created by a massive amount of history and circumstance.