We studied scientific management the other day (I'm taking a leadership course), and no mention was made of the sex, age, class or otherwise of the workers involved, but the key point is that they were considered as essentially machines, and as entirely motivated by money. It's a very reductionist view, and having looked at American industrial history factory workers were all treated very harshly (lots of strike breaking, shipping in workers from other countries etc). The other thing to know is that as a movement it has been pretty much abandoned (now it is mainly taught as a how wrong they got that and how time has moved on type lesson). However the reason that it has moved on is that at least in the West, most companies rely on their workers as rather more than a pair of hands because of the complexity of work.
Ford is interesting because one of the things he did was to pay his workers more than the market to reduce high turnover. He did talk about them being men, so I don't know if he employed women.
I don't know why Demming was included in that list, he was all about systems, but also about how individuals at all levels play a very important role in learning an teaching and continuously improving systems (so pretty much the opposite of scientific management).
Walmart are of course well known for discriminatory practice as well as for lean supply chains and using their bargaining power.
But yes they were all about efficiency, and in work at least, there is nothing wrong with that. Working in inefficient systems and being able to do nothing about them is incredibly frustrating for everyone, empowering people to bring about positive change generally makes people happier.
For me the question for darcymum is why she dreads going back to work so, and how can she find something that she would enjoy, because life is long and whilst I think the orthodoxy that it's only babies who need a parent on tap is wrong, I don't think that making your entire life centre around house and home is very healthy.
For DeirdreB I'd ask whether she would give a son different advice from her daughter, and if so then I can't see that that is compatible with feminism.