The emotional commitment issues are worth taking seriously, but I wonder if we should compare it against the unhealthy obsession with the Love Of Your Life that comes with the nuclear family. Half of marriages end in divorce, and those that stay married often end up resenting each other.

They probably intended more of a "everyone rotates nannying roughly equally" which wouldn't have that problem. I wonder if something can be salvaged from their attempt or we need an entirely new form.