>>64278837
On a fundamental level, communal child raising was a response to old tribal societies where basically anyone could just drop at any second, the risk of your kid dying before 1 was very high, the odds of one of your parents just randomly dying one day because of a disease/hunt gone bad/rival tribe invasion were very high, plus there was also a very real possibility that you'd somehow get separated from your tribe and basically never see anyone you knew ever again, basically having to start from scratch if you were lucky enough to find a new tribe. In a society like that communal child raising makes sense, don't get too attached to your parents or kid because it'll be easier to deal with them dying if "it's okay, I got 40 other moms."
In modern civilized society people don't die anywhere near as much, thanks to medical breakthroughs and just overall less random violence, infant mortality is a rare tragedy instead of a coin flip and your parents are generally expected to survive well into your middle age, we have the "luxury" of forming close lifelong bonds now, which we generally seem hardwired for but couldn't do for a while just because it wasn't realistic given the circumstances.