It's always an odd bit of reasoning that comes up in a Christian community in times like this especially.
On one hand there will be those who will claim certain matters in scripture pertain not at all to Christians today, because those things were exclusively applied to Jews in the OT.
Then, for example in issues like that in the OP, we'll insist first century and older morals and relationship practices apply to this day in marriage.
God forbid a Christian family adopt and practice Old Testament marriage and family rules and standards.
In for a penny in for a pound.
We can't admonish and advocate one practice, like the man in a marriage is primarily responsible for the family dynamic, making marriage a Patriarchy , when God said the two become one, equals, in marriage, and ignore the rest.
And as pertains to the divorcees in the OP, holding to Biblical marriage rules, the ex-wife being remarried is technically an adultress.
Making any children with her new husband, should they have children, bastards.
If marriage rules according to scripture worked, and if it were true, the family that prays together stays together, Christians wouldn't qualify as a divorce statistic.
Rules are never the problem. Divorce stinks, as I know all too well. But there are times when people do not follow the right principles and instructions. People are the problem. Ex wives have ex husbands. So the husband is an adulterer, according to the legalistic approach.
What people seem to forget is that we are living under the covenant of grace, not law. When God forgives, He forgets. Cultures vary, but in my white European culture, if a marriage fails its the man's fault. He will be asked to leave the church. His ex wife will get the support and her side of the story heard. The guy will get trashed. Now I escaped some of that because I had a pastor who had been divorced himself, and he refused to judge or take sides. I still got visits from people I considered friends who brought their whips with them. I was not permitted to say anything and I did not intend to try and justify myself. It was no fun listening to people who made themselves judge and jury without hearing the facts.
Now all this was a long time ago and I've not remarried. It just seemed too much like hard work and my social circle was not full of eligible women. However, I blame no one for wanting to remarry. Some people need a spouse and God knows that. The attitude that the innocent party (If there really is such a thing) cannot remarry either is just wrong. God will not punish the innocent with the guilty. We see this with David and Bathsheba. If anyone should have been punished, it was David. God spared him, not only that, it was Bathsheba's son who became King after David.
As to morality, God has not changed. If anything, the Law given to Moses is a watered down version of what God truly desires. Lord Jesus spelt this out in the Sermon on the Mount. As to authority, God also has not changed. Women are of equal worth to men. However, God formed Eve to be a suitable helper for Adam. That also has not changed. Wives should submit to their husbands. Submission does not mean physical or psychological abuse either. Husbands need to submit to Christ so that they may know how to treat their wives appropriately.
I believe that Joyce Meyer has the right balance. She preaches and practices submission to her husband. Yet she has a world wide teaching ministry that has touched millions of lives. She does not pastor a church. She ministers mainly to women. Men come to her conferences, and why not? Anything that helps guys understand a woman is pure gold!
People come to Christ with various problems. Some take a good deal of time to resolve. Some of these problems are toxic to a relationship. Sometimes it takes a catastrophe to get people to wake up and seek help. Divorce is not the unforgivable sin. God can work even that failure for our good, if we will let Him.