[RickS]

> how are these factors different for men than for women?

For the sake of this argument, they aren't. It's not about which gender they impact. It's about what percentage of relationship participants they impact.

Right now ~50% of relationship partners face credible career setbacks as a result of post-childbirth leave. Changing that percentage to 100% is probably going to have some ripples.

That's not to say it might not be worthwhile, just that it's unlikely to be as simple as "flip a switch, everybody acts the same".