Honestly if we all condensed everything we've ever done in say the past 40 or so years, relating to work and home into a brief, or not so brief list, anyone can walk around humming to themselves "anything you can do, I can do better"
Everyone's circumstances are different, I do think at times that is being overlooked here, if like Callistemon you have a husband working away from home then a presence of one parent I imagine as the main lynch pin for home and family would be required. Some on GN have stated they have quite a few children, 5 or so, I can't imagine how the logistics of managing a family of that size would slot into the working life, I know Nicola Horlick and others have done that very thing, but on huge incomes, I imagine every paid help possible is at their disposal. There are posts here that state their own circumstances, and often they will be irrelevant to other people's lives. In an ideal world there would be two parents to share the day to day running of the home and raising of the children that is not always the case. I know single parents who have had to do major juggling, I know people who have had paid au pairs or nannies. Personally, I don't think palming one's children off on aged parents is always a good idea, unless they are specifically forthcoming in wanting to do that, but in my experience the generation above us were far more of the mindset "you had them you look after them" school of thought.
When I had my children I had been at work for something in the region of 15 years. We fully discussed me staying at home to look after the children until they went into full time education. My husband was by far the major bread winner, although I am at pains to point out that many women assume that role these days, I know of several couples where the woman of the household earns the most.
Do I think my staying at home in their early years made me a better mother, not particularly, it was an extreme learning curve and I hadn't had experience of being around babies or young children before so in some ways a rude awakening. All I can say is I did my best and of course made my mistakes, many things I'd do differently with hindsight, but I'm sure many of us who don't proclaim to have superpowers would put their hands up to that!