I don't think there's that much disagreement here really.
Skills..... DW's point was some SAHM put too much into it, the perfect child who doesn't know how to use a bus or work out the london underground timetable when they're 15 etc.... You can't generalise but some chidren are too fussed over so they don't learn to organise to get their school stuff out on their own (because their parents are both leaving early for business trips), don't know how to use public transport, haven't learnt how to self protect in public slightly dangerous places, can't cook for themselves because mummy always does it. It's not a major issue between SAHM and working of course.
I think the nub of DW's and my point is perhaps "It's not a selfless act. It's a self indulgent act because you want it." In other words don't do the self sacrifice for the children. They won't thank you and they will be no better off. Do it because the domestic home and apple pie is what you've always loved and you like being at home with children and for you it feels the right thing to do and so much nicer than the horrible old office.
I'm not surprised you say it's "pretty damned offensive" because it gets to the heart of the issue - is it really worth what you give up personally and financially by staying home particularly if you don't enjoy being home that much. I would say no and get back to work. Those who made the choice, may be don't like it very much, perhaps have pressure from children and husband to stay home have to justify their decision.
"most employers are still too damned benighted"...No, no. Childcare is an issue for parents male and female to arrange. No reason in a free market economy why an employer should take decisions bad for their business to enable a father to leave at 2.30pm to meet the chidlren from school or a mother to go on the dot at 6pm so she can relieve the nanny. Make sure there is no sexism in your relationship with your man and he is as worried about the childcare as you. Don't marry men who aren't like that or things will never change.
"Women died so we can work". I have said on other threads women have always worked. I didn't repeat it on here but I certainly agree with you. In the UK some women starved themselves to death etc when they were trying to get the vote, rather than to work. So I was wrong there. It's certainly a pretty rum do if women work so hard for so long so they can run hedge funds and be surgeons and then those women marry richer men and give it all up to stay at home. But I suppose some women must just enjoy that. I can't understand them but I wouldn't interfere with their choices as long as their husbands have an equal choice and they are brought up and bring up their daughters to be aware women can work if they choose.