There is a strong color of myth and legend in the record of the story of "Dayu controlling water". Can you tell me why?

First of all, due to the underdeveloped technology and obvious totem worship in the late primitive society, people will unconsciously associate mysterious factors when they encounter force majeure of nature. "Dayu's water control" happened in this context, and large-scale natural disasters such as floods are more likely to cause panic and misunderstanding. In addition, Xia, the first dynasty in China, needed to be ruled-Qi, the founder of Xia, was the son of Yu, so it was necessary to use legends to myth himself and achieve the purpose of rule. Finally, because of the long history-the Xia Dynasty was founded around 20 10 BC, the clear record of history was probably after the Zhou Dynasty, and the earliest literature describing this story was in the contention of a hundred schools of thought in the Zhou Dynasty, that is, 1000 years after Dayu-even clear human traces are hard to find. We have watched it for a long time.