I think the other thing is that many ppl have posted saying "we can afford it with tax credits/housing benefit".
What it actually means is "we cant afford it but society has (quite rightly) decided to support families on low incomes by paying benefits to tose in work but on lower wages".
With the cost of housing, I'm not sure any of us can afford to live if we look at it too carefully.
To answer the pps question, I trained as a chartered accountant and originally I went back to that job part time, but then I changed careers to something with no commute and a good pension scheme, so that I could be home by 6 every day and build up a decent pension despite my time out of paid work.
But you have to look at this over the long term, I think. I have never regretted my 7 years SAHM and 5 years PT. i enjoyed that time at home. I look at women 10 years younger than I am, who have reached the top of their pros signal already, and think, maybe too much, too soon. What do you do for the next 25 years? Whereas me, I am still pretty much nobody at work, so lts of scope for climbing that greasy pole in my 50s and 60s.
But equally, if I had never gone back to work, now I would regret that. When DS left school there were mothers there, their youngest just having hit 18, saying vaguely they must get back to work some time. On the whole, it's been a bit too late for them, and they are frustrated because they have a lot to give but no context to make the contribution they want to. Volunteering and so on, nice of course, but they want something more.
So for me anyway it's about keeping your employability fresh but not feeling you have to rush straight back into it.