Totally.
It’s nonsensical if you apply it to the real world.
Newborns are really fucking full on, so being bonded to them through love/mammalian biology and/or legal or professional obligation is really the only thing that stops us leaving them under a bush (or eating them like mama cats).
Imagine if you were a team of 8, with none of the love and none of the obligation. It would only take a fortnight of relentless colic before you all found something better to do than wipe sick out of your hair.
plus imagine the personality disorders kids-on-a-care-rota would grow up to have? Even in the best organised, well resourced circumstances the lack of a primary caregiver can fuck a person up. It’s why they don’t do boarding schools for infants.
Two single mums with similar aged children in a reciprocal baby sitting agreement (with their own separate households) is about as close to child-share utopia as real-life is likely to get.
And that’s fine, because like Bernard said my relationship with my children is the most intense and important thing in my life and I wouldn’t want to replace that with a team time-share.