The NT doesn’t tell us anything new except for the life of Yeshua. It is simply a re-itteration of the OT. The point that you are implying is that Yahweh made a mistake when giving His commandments but if that is so then why should we trust a God that makes mistakes? Or could it be as stated in Isaiah 55 “I don’t think the way you think or work the way you work” or when he says “mens glory fades like flowers in the fields but the word of Yahweh stands forever.” Could it be that Malachi got it right in 3:6, “For I am Yahweh, I change not; therefore ye sons of Jacob are not consumed.”