The Nuance of Spirit-Led Legality Doesn't Need Written Law to Keep Within Righteous Bounds
The possibility of going past God's written law's boundary is not a possibility of shattering all His boundaries. Even though we are not under the written ordinance, we are under the Law of the Spirit of Life in Christ Jesus. Just because I make the decision to loot the corpse of the person I righteously killed without murdering, that doesn't mean I should steal generally or that I should break every one of the Ten Commandments just because I want to. God still hates lies, so, because of my new nature, I don't want to lie and cannot find any good or use in it.
There is repentance from sin against the Law of the Spirit of Life, and we simply don't need the writings to tell us what we should and shouldn't do.