I understand your point and agree that we no longer need to be bound by the Old Law because of the freedom Christ’s death has given us.
The value of the Ten Commandments is that they show us our sin and therefore show us we need the Savior. Since no man can keep them, every man needs Jesus’ atoning sacrifice. Without the words of the law of one cannot come to that place.
No argument there at all. 2 Timothy 3:16 tells us that all scripture is useful for instruction and reproof. The Old Testament and the Old Law is a type of the New Covenant. It contains much wisdom which is useful for understanding the New Testament.