The law was not given to reveal aspects of God's nature, it was given to reveal sin (Romans 7:7).
We have been released from the law (Romans 7:6; 1 Corinthians 9:20).
We have new law (Matthew 22:37-40), which fulfills the law (Romans 13:8-10).
God's law is described as holy, righteous, and good (Romans 7:12), and it can only be accurately described as such if the content of its laws reveal to us how to do what is holy, righteous, and good, which are aspects of God's nature. By denying that the law was given to reveal aspects of God's nature, you are taking the position that the laws that God chose to give are completely arbitrary and that they teach us nothing about who God is. For example, when God commanded to love our neighbor, your position is denying that we can learn from that command that love is part of God's nature. Sin is against God's nature, so by God's law revealing what sin is, it also revealed aspects of God's nature through doing the reverse. In other words, God's nature is the mark and sin is missing the mark, so by God's law revealing what it means to miss the mark, it also reveals by contrast what it means to hit the mark.
The only way that we can be released from the God's law would be if God's eternal nature were to cease to exist. In Romans 7:21-25, Paul said that he delighted in obeying God's law, but contrasted that with the law of sin, which held him captive, so Romans 7:6 should be interpreted as Paul speaking about being released from the law that held him captive rather than the law that he delighted in obeying, but sadly you would rather be released from the law that God gave as a gift to be a delight so that you can be bound to the law of sin, and which is the reverse of what Jesus gave himself to accomplish on the cross. In 1 Corinthians 9:21, Paul said in a parallel statement that he was not outside the Law of God, but under the Law of Christ, yet sadly you would rather be outside of the Law of God and not under the Law of Christ.
In the New Covenant, the former regulation has been set aside because it was weak and useless (Hebrews 7:18), and
a new law given in Matthew 22:37-40, which fulfills the law (Romans 13:8-10).
In Matthew 22:36-40, Jesus was not asked to give a new law, but rather he was asked about which commandments out of all of the commandments that God had already given, and Jesus responded by quoting two commandments that had already been given, so he was not given a new commandment. The greatest two commandments have always fulfilled the other commandments, which is why they are the greatest two, so Jesus was not making any changes or giving any information that was new. Likewise, in Mark 12:28-32, Jesus answered the question about the greatest commandment by quoting the Shema and the teacher of the law agreed with him, so again Jesus was not saying anything that wasn't already understood by others. A sum is the total of all of its parts, not something new that is different from its parts.