For example, having time with parents (parental leave) is a right of the child, not a luxury for the parents. In that perspective it's much harder to frame tax-financed parental leave as a handout to the parent. Without it, some children would miss out on something through no fault of their own.
Maximizing the use of paid parental leave I see as pretty much a given. I don't think many see it as the most important factor for planning a pregnancy, but I absolutely want to maximize the amount of paid leave I can take. My kids are 6 and 8 and I still do multiple weeks of parental leave per year. Typically doubling my summer holiday from 4 to 8 weeks or similar. It's a benefit I have paid for many times over. There have been suggestions though that this is an unncessarily luxury and it would be better (for children) if parents had to use the majority of the parental leave before age 3 instead. I kind of agree.
For these policies to be even remotely understandable I think the key is as I said to fundamentally see it as money spent towards children, not parents.
So, taking the maximum amount of paid leave they are allowed. How is this an issue? Do you take less pay than offered? Please explain how maximizing your benefits if wrong.