I think people are arguing that to be fair, time spent on raising children should be shared equally between father and mother.
That's not really true. If all women chose to raise children instead of working, many products would have poorer design due to lack of diversity in ideas. And if 95% of women chose not to work, the 5% who want to work will have a harder time in many respects.
Why should the preferences of the 5% override the preferences of the 95%? A widespread norm of two incomes per household makes it much harder for women to be homemakers and full time mothers (since single income households have to compete with dual income households for positional goods like housing).
That is not the only alternative to a male-dominated workforce.