My parents both grew up in large families (10 kids and 8 kids) and most of their peers grew up in large families (5-12 children) and what I hear from my parents

My parents both grew up in large families (10 kids and 8 kids) and most of their peers grew up in large families (5-12 children) and what I hear from my parents, aunts and uncles, and their friends is, unequivocally, you don't. There's simply not enough parental resources to go around when you have that many children to provide emotional availability to everyone, even if one parent is a full time caregiver. You end up feeling much more like a number, "child #7", than an actual person, and it's extremely difficult to develop a sense of self. The research backs this up, the larger the family the worse outcomes are in almost every measurable category - academic achievement, criminal convictions, salary, teenage pregnancy, etc. Siblings often become extremely resentful of each other in these arrangements because they are usually forced to either parent their siblings or be parented by their siblings, they compete for parental attention and get bitter because they can't get it, and they can't find private alone time. This sort of resentfulness shows up in weird non-overt ways that's hard to describe but easy for parents to miss. The siblings still end up spending time with each other in adulthood anyways, probably some sort of Stockholm Syndrome. That doesn't mean they like each other. Maybe there exist some person on Earth who is capable of caring for so many kids. But I haven't personally seen it.