Yes same thought came to me as well. Once brains got more capable of processing, just like supercomputers. Also maybe these early explanations from ancestors of afterlife might be early reference descriptions of our recycling universe according to there understanding of the words and how world they only knew at that time. Our former society's did not have comprehensive facts on how nature worked, so they used old terminologys like rebirth, reincarnation, afterlife gods and god etc but today science explains it with different words like recycling universe, electron flow lighting etc not some thunder god in the sky.
Like always, question everything