If this is true, which there seems to be enough scholarly consensus around it or similar claims, then this is a good example of why God says His people are destroyed for lack of knowledge. Some of His children are reading these verses, filling in their own understanding and not knowing the actual truth of the matter, and then using them as part of an argument to undermine keeping God's will as expressed in His commands.
I think it's really simple on beards and trimmings: these verses are about doing these things in a particular way with respect to pagan deities. God doesn't want His children to do that, the Messiah didn't do it, we shouldn't do it.
Law was given to increase sinning:
Romans 5:20
20 The law was brought in so that the trespass might increase.
Law stirs up sinning:
Romans 7:7-8
7 What shall we say then? Is the law sin? Certainly not! On the contrary, I would not have known sin except through the law. For I would not have known covetousness unless the law had said, “You shall not covet.” 8 But sin, taking opportunity by the commandment, produced in me all manner of evil desire. For apart from the law sin was dead.
Law produces death:
Romans 7:9-11
9 I was alive once without the law, but when the commandment came, sin revived and I died. 10 And the commandment, which was to bring life, I found to bring death. 11 For sin, taking occasion by the commandment, deceived me, and by it [the commandment] killed me.
Law produces fruit unto death:
Romans 7:5
5 For when we were in the flesh, the sinful passions which were aroused by the law were at work in our members to bear fruit to death.
Law is the power of sin:
1 Corinthians 15:56
56 The sting of death is sin, and the power of sin is the law.
Tell us again how the Law is God's will for those IN CHRIST expressed in His commands?
No, God's commands after the Cross are these:
Believe in the One He has sent and love one another (Jn. 6:28-29, 1 John 3:23-24).
The New Covenant is NOT LIKE the Old. God said He'd write His lawS on our hearts (see 1 Jn. 3:23-24), not The Law (single, comprehensive system of law) on our hearts.
Believe in Christ; receive eternal life.
Love one another; you have fulfilled the requirements of God.
And even the love comes from Him as Fruit of the Spirit - and if you are led by the Spirit, you are NOT under the Law (Gal. 5:18).
-JGIG