What seems to be missing is the Jewish understanding that when Messiah comes he will make everything new and give a Torah that would far surpass and make vain the Torah we have now. It's just common Jewish Messianic thought. "The Torah which man learns in this world is but vanity compared with the teaching of the Messiah." Midrash Qoheleth
RaMBaM said "Torah which we now have was given to Moses" and "This Torah will not be changed nor will the Creator -- may he be blessed -- institute any other Torah". Yet he then states in "Ordinances of the Kings" that the King anointed as Messiah will "sit on his kingly throne and write for himself a Book of the Law in addition to the Law given to our Fathers" and "He will compel Israel to obey these commandments".
It's simply not a Jewish concept that the Torah given at Sinai is the Torah for all eternity. Judaism has always believed in a Messiah that would come and establish God's laws in person. The only group who demands that the Torah given at the mountain is the Torah Messiah also gives when he comes are one law. Jews know that the Torah given at Sinai was given because of a corrupt heart within the people. When Messiah comes he fixes that corruptness, thus making that Torah complete. What was given for our healing has brought healing to us, namely Messiah Yeshua. So to demand all must fall back under the surgeons knife after we are healed is very sinful, to me. Torah brings Yeshua, who bring the healing of the nations. Yeshua is the center of the universe, not the operation that reveals his coming. Torah is completely observed by knowing Yeshua personally. His instructions are given in real time within us now. In this way Yeshua=Torah, as he is revealing the will of God 'heart to heart', not scroll to heart. And Judaism has prophesied this for centuries. As proven by the quotes above.