I'm a high earner. I have no money issues, what I have are time issues. I'm a single parent with high flexibility and every single struggle I have with my child could be relieved by having a homemaker to distract my kid and take care of the impacts of my kid. I do more than double laundry and clean more often and burn hours at places I don't necessarily want to be but the kid does. My career has stalled out because I don't have the extra hours it takes to get promoted.
Now imagine this in Japan where they're not just working 40 hours a week, looking at add 5-10 more for advancement. That's the issue of children in my opinion. It's why very wealthy people hire nannies. It's the only way to free the most value resource you spend on children: time.