> But I disagree on the point that the role of motherhood inextricably falls down on a woman's turf for the years to come.

As a practical matter, the latter follows the former, almost inexorably. Between the negative stigma of being pregnant at work to the negative stigma of taking maternity leave, to the negative stigma of having to be there for your young child when it is still in the "I need my mommy" stage (which lasts into the first couple of years), by the time the father can assume a fully co-equal role in parenting the woman has already substantially compromised her career and it becomes rational, in a perverse way, for her to be the one to undertake further compromises.