The story of Joseph is the only story of one person that covers a long space in the five books of Moses (Genesis, Exodus, Leviticus, Numbers, and Deuteronomy). The great fathers we know in the Bible are Adam, Enoch, Abraham; Isaac and Jacob do not have as much personal history in the Torah books as Joseph. why? That is the question.
Moses is the leader of Israel after Joseph. Israel was hurt by Joseph's death. The kings who arose after his death were not good for Israel. Because of this, the story of Joseph was a comfort to the Israelites. Moses grew up not studying this history. On the other hand, Joseph studied the history of Israel
