I'm thinking of people I've known or known of who had difficult home lives because of factors other than that their parents were emotionally, socially or intellectually inferior. Their parents were successful and these people benefited from that in a way that I don't think can be easily quantified. Obviously children in those situations can still get damaged to the point that it's seriously and irreparable but I think if we put certain extreme forms of abuse aside, they generally fair better than people with untroubled home lives with mediocre or worse parents. Mediocre as in less successful be it financially, educationally, friends-wise. Even good looking jock parents produce overall happier kids if the kids get their physical attributes and plus jocks are usually happy and confident so the kids will know they can expect some success and evaluate themselves as healthy. But if the parents are insecure, emotionally needy, weak in the face of the humans around them, their kids come into the world seeing themselves as subhuman.
I know it's hard to quantify and compare but I think people can get past bad relationships with parents who are strong people but not good relationships with parents who are weak people. We can define a bunch of these terms a bunch of ways but I get the impression that being raised by happy successful people is always going to be slightly better because it's not so much what parents say, it's what they do and I would even say it's not so much what they do, it's who they are. Children will figure out what they're made of regardless of any conscious role modeling let alone even weaker factors such as ritualized actions or things they say. If the children see they are from strong healthy (in a selfish way) parents those children already have a huge advantage over everyone else and it takes extreme abuses to undermine that advantage. Whereas with weak people or people with deficiencies that humble them in the face of the world or that deprive them of full social validity, their children will know they are coming from inferiority and it would take something extreme to overcome that. Even if these inferior people were not abusive as parents their very nature as inferior will mean the children will end up feeling inferior.
I've seen people I grew up around and the ones with loser parents were and stayed losers. The ones with winner parents might have had ups and downs but in the end their journey was overall better and they put themselves together later on as adults.