So many cliches in this discussion. 'farming children out on other people to bring up'. When you talk to mothers, even now, it is remarkable how little childcare they actually have, even now, because it is so expensive. In my day because it didn't exist, Some children had grandparents near by, but most didn't. Many of us worked part time and fitted our work around our children.
DS, now in his 50s, only recently realised that tthe reason he did all the sports courses he did in the school holidays was because the Leisure centre was very close to my office, so while he did swimming, gymnastics etc. I nipped into the office and did a couple of hours work
Similarly, the myth that all SAHMs were devoted to their children and domestic goddesses. I knew quite a number, who were anything but, farming their children out on anyone who would take them, while they went off socialising.
I am with those who say that everyone makes decisions based on their circumstances and personalities. When I look around at friends and families, whether they were SAHM parents or had both parents working, now with their children grown up and outcomes have very little to do with whether they had SAHM or not and much more to do with other aspects of the family or just the personality the chld was born with.