That's the issue right there. Not surprised "One in four Swedish dads take no baby leave".
I know things are tricky to roll out, there's tons of quirks here and there. User chongli is on like three leaves of the discussion trying to take the idea down based on implementation details. That comes later.
The whole point is that right now it's a "woman's issue". Forcing men to deal with it would make it a "parent issue", and more resources would be devoted to ironing out the details.
It's like that pithy line I heard once- "If men could get pregnant, abortion wouldn't be controversial".
edit: Can't reply, but I got your reply just fine dalke. What I'm saying is that making it use-it-or-lose-it is still not good enough. Rather, if you don't get why I suggest it needs to be mandatory, it is you who is not getting me.
edit2: Fanning threads on HN are just no good for discussing stuff. Sorry!