Because nowadays when a system is created (born) a basic package of the sum total of current knowledge is downloaded onto the system (school) with a vast array of optional packages one can choose from (books, college, etc). To add to the sum total of knowledge is a painstakingly long process in comparison (phd, r&d, innovation). But someone had to be the person to git init and make the first commit. Even if they had the same specs, they didn't have access to a 10k+ year old code base. If a modern person had grown up in ancient civilization, I guarantee they wouldn't be all that much more knowledgable than others of that time.