I'd have to find a copy to see if it cites its source but paraphrased I've heard it:
> People mechanically can have kids, physically, before they're mentally able to take care of them. The [village] elders would raise and teach the children while the adolescents worked at things adolescents do better than elders
So "it takes a village" used to be literal, and as we in this part of the west started to isolate and nuclear family the whole idea that the elders should have plurality input to the neuroplasticity kinda went wayside.
I spent a lot of time with my grandparents. They all died when I was young but my sister was younger yet. I moved all our kids to be within 15 minutes of their living grandparents. They werent teens when we got here. My youngest spends 3/7th of their time at grandma's house.
I'll let you know how all this works in like 30 years.
I think a large, maybe even the main part of why community of family and close friends raising children together works: humans are uniquely motivated by shame and pride, and having that many eyes on you leads to quick corrections before bad habits take root.
There's arguments about in groups and globalization and if it's better to amalgamate and if so, community based child raising has gotta go. Please do not ask me to spell this out as I won't be.