The author is a woman and statistically one could argue control over divorce in the modern west is with the woman. Among the college educated 90% of divorces are filed by women. More generally it's 70%, but some argue that when the husband files he's very often not doing it of his own accord.

There are large numbers of divorced boomer women going into old age alone and poor figuring out they made a huge mistake.

So for a female audience this is probably important advice.