Laws, Commandments, Judgments, Ordinances and Statutes. Who knew.
People in captivity as slaves 400 years. They know nothing about how to run a nation. They don't know how to run a temple or its sacrificial ritual requirements are, or how to govern or collect taxes or Judical laws etc. They don't know anything about being on their own and how to serve God and the consequences there of.
The temple basically all that was left, was itself under Roman rule. Once Christ left the earth and it would be gone in 40 years. SO with no Nation, land. government etc. and soon to be no temple and no more blood sacrifices (Lamb slain) there really weren't any laws to follow anymore.
The Statutes and ordinances that went with the temple sacrifice got nailed to the cross. That pretty much leaves only the COMMANDMENTS. Not only were those written by God Himself and place IN THE ARK they were 'restated by Christs own words.
Christ came and followed the laws and FULFILLED the prophecies that were written about Him in the Laws and prophets.
The law of Moses is about doing it right. Treating God right treating each other right.
We should understand the some of the commands given to us by Christ contain the 10 commandments AMPLIFIED by a whole bunch. But that's ok because we are ALSO given the Holy Spirit to lead and guide us and help us stay on the right path.
When Christ returns to rule with a rod of iron, discipline and order will be followed. There will be laws followed and I don't think they will be of an order much different than the ones we have previously had.
So nothing was destroyed, all just got better for the time we are living. Now, all we have to do is keep up the good work. After all, we never know when He will be coming to meet us. Could be any moment. A blood clot, heart attack, car accident, slip and fall, none of us know when our last day will be, but we do know that once that moment comes, there will be no more time to do any works and those are the only things that follow us so we best have lots.