IMO dads don't achieve the same level of bonding as women do to their babies and therefore we are able to tolerate less of the crap babies get into during the day.
Its not sexism, its just biology.
If I had a project I worked on for 9 months I would have more desire to continue working on it into the future. My investor is an interested party, but ultimately its entirely my drive which moves the project forward
What is the alternative position you're suggesting?
I think the effects of evolutionary biology need to be considered when looking at behavioral differences. Evolutionarily speaking, women invest much more energy into growing, giving birth to, and caring for children than men. This leads to innate differences in behavior separate from social forces you are describing.
The reason why women are more involved in childcare after giving birth/nursery years is purely societal factors. It's expected of them to behave in that way in more conservative places and it's strongly implied in other places.