- This is NOT the norm. This matters because what's more interesting is the general case, not the exceptions.
- It affected your work, in this case of a man instead of a woman, so the point remains: WFH is very hard for working couples with young children.
As for the relevance of the impact on mothers: it is VERY relevant and highlights the inequality that still remains in Western society. People by default assume the mother will take care, it's happened in every situation and every couple I talked with, and it's my own experience as well.
I'm not accusing you of anything, and if you feel personally addressed, that's on you.