If you would read closer, you wouldn't have so many problems. I had said that the
objective of Jeremiah 31:31-33, was to have the Law written on one's heart. The same message that Moses gave to Israel (Deuteronomy 10:16), And Jeremiah gave to Jerusalem (Jeremiah 4:4), which was to circumcise their hearts. Ezekiel 36:17 & 24-26 indicates that happens despite the "stiff necks" of Israel,
after the "house of Israel" are gathered out "from the nations". The oral Torah, is the traditions of men, and is the "pen of the scribes" which makes a lie out of the law. As for "shepherds" being judged, see Ezekiel 34:2, which states "Woe, shepherds of Israel who have been feeding themselves! Should not the shepherds feed the flock? You eat the fat sheep without feeding the flock". Ezekiel 34:16, "the fat I will destroy". Ezekiel 34:17,"I will judge between one sheep and another, between the rams and the male goats". The rams and the male goats being the leaders, such as the Pharisees and scribes, the keepers of your Talmud. As for a single shepherd, see Ezekiel 34:23, "I will set over them one shepherd, My servant David".
Jeremiah 4:4 Circumcise yourselves to the LORD, circumcise your hearts, you people of Judah and inhabitants of Jerusalem, or my wrath will flare up and burn like fire because of the evil you have done- burn with no one to quench it.
New American Standard Bible Deuteronomy 10:16
"So circumcise your heart, and stiffen your neck no longer.
The circumcision of the heart refers to our kavanah, our intent to do the right thing. IOW, am I doing right because I don't want to get caught doing wrong and punished and because I want to go to heaven, or am I doing right for the sake of doing right and obeying God simply because he is God and deserving of my obedience?
Having the law written upon our hearts is something else entirely. It means we don't need to be taught what is right and what is wrong, but instinctually know it. Obviously that is not true yet (including among Christians). Our inclination to good and our inclination to evil often conflict and can leave us very confused. We would defend our sister against a bully, but would we defend a stranger against a bully? We have to be TAUGHT not to stand idly by our neighbor's blood, because it does not come naturally. In the messianic era, the law will be written on our hearts, meaning we will no longer need to be taught it.
I think you need a better understanding where Oral Torah comes from.
First, you need to understand that you cannot obey the Torah unless you have Oral Torah. For example, the Torah says to rest from work on the Sabbath, but it doesn't tell us what "work" is. Different people would have different ideas, and how could Israel enforce the law if there was no agreement on what it was? SOMEONE needed to determine what "work" was.
It is so necessary that there is no way that Jesus existed as a Jew without obeying Oral Torah. Everything from how many knots tied his tzitzit to how to lay his tefillin was determined by Oral Torah. To get around Oral Torah, he would have had to have gone hog wild and quite being a Jew.
But it's MORE than that. The Torah itself creates Oral Torah. You cannot possibly accept the Torah without also accepting the God-given authority of Oral Torah. See Deuteronomy 17:8-13
8 If there arise a matter too hard for thee in judgment, between blood and blood, between plea and plea, and between stroke and stroke, even matters of controversy within thy gates; then shalt thou arise, and get thee up unto the place which the LORD thy God shall choose. 9 And thou shall come unto the priests the Levites, and unto the judge that shall be in those days; and thou shalt inquire; and they shall declare unto thee the sentence of judgment.
10 And thou shalt do according to the tenor of the sentence, which they shall declare unto thee from that place which the LORD shall choose; and thou shalt observe to do according to all that they shall teach thee.
11 According to the law which they shall teach thee, and according to the judgment which they shall tell thee, thou shalt do; thou shalt not turn aside from the sentence which they shall declare unto thee, to the right hand, nor to the left.
12 And the man that doeth presumptuously, in not hearkening unto the priest that standeth to minister there before the LORD thy God, or unto the judge, even that man shall die; and thou shalt exterminate the evil from Israel.
13 And all the people shall hear, and fear, and do no more presumptuously.