But there is no need for "memorizing" tradition when that tradition is based upon nature.

You live within nature so what is there to lose?

That is why there are close similarities to indigenous cultures across the globe. Take the native Australians, why is their culture so similar to native Amerindians when they were not ever in contact (or if so it was many centuries ago)?

What have Afrikans or any other indigenous cultures lost except for when they were invaded by writ-based outsiders and the outsiders established the original culture as inferior or savage. Only then has there been problems with lost legacies.