Galatians 3:28 is it only about salvation?

According to complementarians, Galatians 3:28 is not about equality in Christ, but about all of us being in the same “boat” of salvation. The Council on Biblical Manhood and Womanhood (CBMW) has made quite an effort to try to demolish Galatians 3:28 as a basis of spiritual equality outside of salvation. Instead, they say that this verse is only about the equality we have in Christ in regards to salvation. In Recovering Biblical Manhood and Womanhood pages 71-72, John Piper and Wayne Grudem comment:
The context of Galatians 3:28 makes abundantly clear the sense in which men and women are equal in Christ: they are equally justified by faith (v. 24), equally free from the bondage of legalism (v. 25), equally children of God (v. 26), equally clothed with Christ (v. 27), equally possessed by Christ (v. 29), and equally heirs of the promises to Abraham (v. 29)…Galatians 3:28 does not abolish gender-based roles established by God and redeemed by Christ.
But is Galatians 3:28 only about equality in salvation? Let’s have a close look at the book of Galatians to find out if this is true.
Paul speaks about agitators who had come into the community and had thrown the Galatians into confusion (Galatians 5:12). These agitators were false brothers, Judaizers and the “party of the circumcision” and they had come into the congregation to spy on the liberty that the Christians had in order to persuade them to come back into bondage.
Galatians 2:4 But it was because of the false brethren secretly brought in, who had sneaked in to spy out our liberty which we have in Christ Jesus, in order to bring us into bondage.
Paul describes in his letters some of the areas that the Judaizers were working to bring Christians into bondage and causing the Jews to treat some with prejudice. In Galatians 5:2, these men were trying to bring circumcision into the congregation of Gentiles. Also in 1 Corinthians 14:34, 35 these followers of the Jewish oral law were trying to silence women in the congregation and they wanted to stop women from public learning. …