Hi, fatcats!
…you’ve just put a smile on my face!
Your point is exactly what many (including scholars) fail to comprehend… when Yahweh God spoke to Israel He did not need to reinvent the wheel: they were His chosen people and they had the Law written in their hearts (obedient children) and written on Sacred Scrolls (or kept in the Oral Tradition) to guide all of Israel.
When the Word became Incarnate He came to His own not the Gentiles; hence, once again, God did not need to reinvent the wheel–He only needed to set it in better materials and give some character: “I did not come to abolish the Law but to give it fulfillment!”
Maran atha!
Angel