It would stop employers discriminating against women of childbearing age, because the risk would then apply equally to men. Such discrimination might be illegal now, but it won't actually stop until the economic incentive is removed.
If men are paid more (due to historical sexism or whatever) they are actually likely to take a GREATER share of paid parental leave so that their partner can be the one to take an unpaid career break when the leave runs out. So it will have the effect of reducing any existing pay gap between the sexes.
It also sends a clear message that men are - or can be - equal partners in raising children. How to trade career vs childcare (and which partner does it) is a decision for couples, not the state. Some men might want to scurry back to work after two weeks - and that's fine - but it should be a decision rather than a social norm.
Simplifies everything for gay couples too. There's really nothing not to like. Thank you Sweden for taking a risk and showing us how it can be done, you've earned the right to be smug on this one