I found this video very fascinating and would love to hear all my fellow non-cishets feel about it. Personally I found it really cool and extremely informative, particularly the bit about "heterosexuality" particularly as an identity being fairly new concepts. Really makes ya think.
This is true. Most housework is pretty low impact or can be done in a couple of hours every few weeks. Childcare is pretty much all of your child's waking hours and there is an economy of scale to multigenerational living. In a lot of cultures, it's older people who are not fit for other forms of labor that do the bulk of the childcare.
Not to mention the standards for childcare have increased considerably, due to 1) living in a low trust society 2) less social mobility. No longer can school age children cross a couple of lawns and go to the park by themselves. And middle class women are tasked with a lot of the enrichment that can be hired out by the wealthy or is provided on a public basis in better-run societies.