My experience, looking at our situation and that of friends and relatives, is that it pays to be ready and it pays to be flexible. Each spouse needs to be ready to do whatever the family needs, including doing what he or she would not do if he or she had the choice. If a woman needs to take a paying job when she and her husband would rather that at least one of them could be home with the kids, well, there is no use grieving over it. The same goes if one of them has to give up career prospects because it is better for the children if they work less, or not for a paycheck at all. If the husband punishes himself because his salary won’t provide all that the family needs or the wife punishes herself because the children are in daycare, it doesn’t help the children. I have seen it very often that the wife has a job because the husband’s job, while a good one, doesn’t provide health insurance. They can’t just leave the family without that, and hope for the best. So she goes to work… Que sera, sera.
When a woman has no marketable skills, the family has no safety net if the father cannot work. If that is by choice, then she has made herself incapable as a help mate in what could be a role that is vital for her family. Even if she never has a paying job, a woman who is willing and able to take a job if the family needs her to can take pressure off of her husband that can otherwise rob him of a lot of sleep.
Also, there are some women who do not do their children so much good by staying home as other women do, too. Some people, male and female alike, simply do not cope well with caring for their children all day, every day. Children pick up on that, too. These are things for the couple to work out. It does no good to look over their shoulders about it.
As for the woman who says “when a woman takes a job, she takes it away from a man who has a family”, well, IMHO, she needs to mind her own business. Why don’t we say, too, that when one of us has more than we can get by with, we take away from someone who is doing without? We are bound to love our neighbor, but the doctrines of justice do not go so far as to forbid those who would work from finding work and realizing a gain for their families. A husband and wife ought to be able to support their family as they see fit. After all, the “ideal wife” of Proverbs is out there buying vineyards and providing for her family, not waiting for her husband to do all of that for her. If there are not enough jobs to support all the families, then that is something for society to address, but not at the expense of someone who would work for the good of her family doing without, and no guarantees that the job she did not take will do some other family more good than the good that employment would have brought into hers.