Similar things are true about attitudes towards adoption by same-sex couples, and about single parenthood in general.

Anyway, for my own part, I endorse the idea that parenting is not a gender-specific attribute, and that it's a job far more easily shared by several adults than entirely handled by one.

That said, I also endorse the idea that parenting is a skill that develops with practice, and my priors for a given parent having put significant time and attention and effort into the practice of parenting is higher for women than men in my culture.

I would add that divorce does not in any way obviate either parent's obligations towards, or relationship with, their child. In particular, I'd say that to think about child custody as a privilege that some parents are granted and which other parents deserve equal access to, or as a resource that parents have contractual obligations regarding the dispensation of, is already getting it backwards: rather, both parents share equally the obligation to make custody choices in the child's interest.

I recognize that many divorcing parents are unable to discharge that responsibility, and that courts often have to step in. And I agree that the courts generally adopt a one-size-fits-all approach that doesn't reflect the actual interests of each individual child, and that's unfortunate.

Come to that, I recognize that many married parents are unable to discharge that responsibility, and that's unfortunate too.

It remains their responsibility.