The problem is not who does the most household work, the problem is that the one who does (usually the mom) can't compensate by not working. A single income is rarely sufficient for a family.
Wasn’t the non-working housewife mostly a middle class thing and a weird blip in history? Women worked long before the baby boom either with less heavy tasks related to subsistence agriculture or cottage industries, and many worked during the baby boom. (I think the difference from today is partly different rates and partly women having actual careers in ways they didn’t before)
Maybe that is a good explanation for the baby boom though.
The problem is not who does the most household work, the problem is that the one who does (usually the mom) can't compensate by not working. A single income is rarely sufficient for a family.