Having more than two people in the house who can act as parents is a game changer. Definitely one place where modern society has slipped up, though there's some change in that with families like mine.
I've been thinking about this a LOT over the years. I feel like children were meant to be able to roam around and find different adults to glom onto until they're too annoyed and then move on to the next, all the while learning different specialized skills and niches to find one they fit in with.
I can't help but feel that more-than-2-adult households would have a huge advantage in this era.
Looking at today it feels we'd alleviate a ton of parental pressure if we had households like that and not depend on the traditional couple.
Teenagers and adults also need a "third place" [1].
It's all about community. Current individualistic trends and cost of living undermine this.
People lose their minds when I tell them I have three kids and that my wife and I have rarely ever had less than six hours of sleep.