[npc_anon]

This suggests an optimum of 2 full-time working adults where after a long day at work they perfectly share the workload of chores.

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.