I also find it relevant to point out that certain elements of the law were "furthered" such as adultery & murder and certain elements of law keeping were condemned (such as the methodology of the Pharisees).
I can tell you that when I was younger I tried to find a lot of ways around the "lust element" and were I to only have OT law I would consider myself "unclean" but not directly guilty of any sin, due to an almost Pharisaical interpretation. The gospels and then Paul's epistles have always been my schoolmaster in a certain sense at times, and when I feel "guiltless" or there is a very vague sin that I've been struggling with, the OT is like "additional instructions" on how it is and the consequences for such actions. Spiritual harlotry is one of the main ones. It wasn't until later in life, when I realized no one really had any answers to certain things that I started digging into the OT and a lot of it opened up, to find out later that yes people do, it is just considerably uncommon.
I believe in the sufficiency of propitiation absolutely, but there are consequences this side of life for certain things and sowing and reaping still applies (though the particulars I'm unclear on). I'm still figuring that out atm, though I do believe reasonable ground has been gained compared to my mid teens/mid 20s. Twas hard fought.