Maybe that's why poly is becoming a thing; it makes sense in America since its individualism ensures that children are independent of their parents, and especially extended family most of the time. Back in the day, children would still stay with their parents even when they have children themselves (and this is returning with inflations getting worse. Heck, there are even traditional housing systems where there is one "apartment" that consists of one extended family. But now, at least in the States, children can travel miles away from their family and pay them a visit only once in a while; so there's no constant handling of children like in the old days. I suppose teachers can fill this role as well, but teachers handle groups of children at the time. They may or may not get individualized needs that need to be addressed that only an adult who lives with them can provide.