Yet there are huge industries of people that are advice columnists like the author, psychologists, marriage counselors, etc. The author suggests that the mundane slog of marriage is romantic. So as you reject what some consider "healthy" in this thread, some of us reject the author's definition.
Maybe her slog is healthy for her husband and her marriage. I have no idea. But I don't believe that is a reality for most marriages. For every cute old married couple who did the romantic slog together and made it; there's plenty others that didn't and got divorced. Or 100 others that didn't get married because they saw a slog coming. This notion, especially with kids, that you don't have to be husband and wife anymore after being married for some time is a problem in my opinion.
Is it beautiful that two people get consumed by kids and make it through the shit together? Sure. But it's also sad because parents get so consumed by kids that they forget to nurture their relationship which existed before. Kids learn a lot from observing that relationship. Daughters learn what a good husband is. Sons learn what a good wife is and how to respect and appreciate her. If they just watch you beaten down all the time being their slaves in their shit show - what do they learn? That they have all the control. And potentially that marriage is what they witnessed. Endless cycle.
IMO it's better for every married couple to put in a lot of effort into nurturing their personal relationship with one another than telling themselves the slog of parenting is romantic and being completely consumed by kids and externalities.