I think it's more that men's share of duties have not adapted to reflect the empowerment of women, combined with a system that continues to penalize women financially for having kids.
This is morally fine and correct from a fairness principle but it misses the point entirely. Dual income workism is the least likely to produce family sizes large enough to not go extinct. The model may be fair but at the same time its suicidal.
Similarly, seeing a work break to take care of children as an "opportunity cost" suggest that the optimum life path is a 4-5 decades long maximalist devotion to some corporate.
Obviously, each individual and couple is free to pursuit whatever they want, but collectively these models and norms will end us.