I just don't understand the mentality of planned outsourcing of child raising along the lines of, "We're both going to make 6 figures working 50-60 hours a week and hire a full-time nanny." Obviously, we all make do with what we are given under the circumstances, but I can only imagine (as a non-parent) that there isn't anything more valuable for a parent than time with one's children, even ignoring the IQ, emotional, and other benefits gained from parent-child interactions.
But which parent should give up their job? What if they find their job emotionally and mentally rewarding? Listen, having kids is great... but it is INSANELY hard work. Not mental work, DRUDGERY work. With screaming. My husband and I have tailored our careers so that we are very flexible (for school plays, sports, etc) and we never work more than 40 hours (of child-awake-time)/wk... but hell YEAH there are things that are just as valuable for our mental health as time with our children!