We need the distinctions in the law (Moral, Ceremonial, Civil/Judicial) that the Scripture gives us because without those distinctions idiots would be out there involved in the silliest of things like trying to keep the feasts and festivals. (Those come to mind because I just bought a book that details how Christ fulfilled all the feasts and festivals and therefore to go back to requiring those to be practiced would be to go back to the shadows.) The OT feasts and festivals, just like the OT sacrifices belong to the Ceremonial law that was fulfilled in the completed work of Jesus Christ.
The civil law abides both in its general equity (the principle lives on that animated the original civil law such as we find in the OT with railings providing protecting from injury) and when warranted in its exact prescription (such as the consanguinity laws). However, the civil law remains distinct from the Moral law. With the Moral law (10 Commandments) we don’t suggest that it may not be applicable any longer. With the Civil law we do suggest that there may be times when it is not applicable the way the Hebrews applied those case laws. Hence there is a distinction between moral law and civil (judicial) law.