As a Jewish believer it's so strange to see you describe it this way. Considering the law was given as a way to enter into the presence of the Holy One of Israel. The law commanded the ark which contained the very presence of God's glory. God gave the law to Israel so they could have a means to enter into his presence. Of course it only really manifested for them when faith was applied to the command. But it was their means of connection none the less. A pattern and image of our relationship with Jesus now. The ark our heart in which he writes and stores his commands.
The law only becomes a barrier when one attempts to use it as a mechanism to attain the presence or righteousness of God. Used without faith it's only going to condemn you. Applying it without the authority of the Spirit is another show stopper. And placing it where it has been removed from, and/or removing it from where it has been placed will definitely get you on the loosing side.
To Paul it was to be seen as holy and usable for many good things. To forsake it would be to shoot yourself in the foot. But to wear it would be to wear a millstone as the waters rise. I like how Paul said we are free, but don't use our freedom to sin. And how he constantly reminded that our union with God through the Spirit is the key to operating our obedience of faith. Because only through faith will the Spirit come and lead you to obedience. That is why the law was to be operated in faith, and why our faith now upholds the law.
We are going to get into a hornets nest here if we are not careful. Perhaps you will understand why the law is a barrier to salvation when we compare the 6th commandment that God gave to Moses with the Mitzvot. Remember it was the faith of Moses that saved him, not his keeping of the law.
487 Save someone being pursued even by taking the life of the pursuer — Deut. 25:12
488 Not to pity the pursuer — Num. 35:12
545 The courts must carry out the death penalty of stoning — Deut. 22:24
546 The courts must carry out the death penalty of burning — Lev. 20:14
547 The courts must carry out the death penalty of the sword — Ex. 21:20
548 The courts must carry out the death penalty of strangulation — Lev. 20:10
549 The courts must hang those stoned for blasphemy or idolatry — Deut. 21:22
550 Bury the executed on the day they are killed — Deut. 21:23
555 The court must not kill anybody on circumstantial evidence — Ex. 23:7
51 Not to bow down before a smooth stone — Lev. 26:1 (Idolotry)
189 Not to benefit from an ox condemned to be stoned — Ex. 21:2 (Cruelty)
008 Not to destroy objects associated with His Name — Deut. 12:4 (Idolotry)
596 Destroy the seven Canaanite nations — Deut. 20:17
597 Not to let any of them remain alive — Deut. 20:16
598 Wipe out the descendants of Amalek — Deut. 25:19
599 Remember what Amalek did to the Jewish people — Deut. 25:17
600 Not to forget Amalek's atrocities and ambush on our journey from Egypt in the desert — Deut. 25:19
603 Not to offer peace to Ammon and Moab while besieging them — Deut. 23:7