AY: You’re singing a different tune in your follow-up. First you opined that “No one outside the marriage is in a position” to a advise a couple not to divorce. Unless your consider Rav Shteinman a “no one” he did exactly that regarding the woman.
And, furthermore, Rav Shteinman related the above told story of that woman and her regretful divorce precisely to teach us a moral lesson about this very subject.