I am a father who was lucky to have a paid paternal leave. I am also a former freelancer who is happy to take care of himself in all situations.
I agree that this sort of benefits which you reap by choice is controversial; i don't see what I'd possibly consider a "fair" amount of benefits here. But I can't agree that cancelling it would make it fair.
All societies typically provide various parenting benefits, but then society also reaps the benefits of having the kids - up to drafting them into the armed forces and sending them to war. Now, some countries don't have mandatory conscription nowadays, but it is not unheard of for countries to introduce it at critical times.