The different (and I'll admit I'm on thin ice here) is that kids have a visceral component that is difficult to ignore.
If I drop a brick on my bare foot and yell loudly, would it be more appropriate for someone else, who has never dropped such a brick, to judge whether or not I should have yelled?
Exactly - and thus there is value in having a neutral(ish) observer of the parenting process.
To be explicit, I don't claim that all articles about parenthood should be written by non-parents, just that there's a particular type of value in ones that are, since they may more successfully divorce themselves from the visceral feelings of attachment that parents have towards their children.
So the question then becomes:
"Does a male obgyn may have a different and valuable perspective from a female obgyn?"
I think the metaphor has been taken too far to be useful here.