In agreement, and I'push another point:

The dual working parents part is a red herring.

Single working parent families were still busy as hell in many circumstances. Even with a single kid there has always been a social push to control (historically)women's time and make them try hard to be good wives/mothers. I include socializing and engaging with their community to be part of it.

Nobody ever had the time or energy to watch after a kid 24/7 while dealing chores, paperwork, the rest of the family etc.