It's not entirely a choice it's socially usually seen as weird for the guy to take more than the minimum or some small portion above that in many of these places. And even if it is a completely free choice (when do those ever exist?) the impact to women's careers extend beyond the setback from leaving the workforce for several months because they're still expected to do more of the labor of child rearing.
edit: To expand ultimately societies and governments need women to have kids, as of now they're the only ones who can after all so I think eliminating as many downsides as possible to that is something that should be done.