I think that the femisist questions around motherhood and the competative aspect are not necessarily from the same source.
I think it's absolutely true that parenthood is less relaxed. Some of this sees to be related to liability culture, and fears and lack of reasonable risk assessment, weird perfectionism about things like diet, an idea that if you do things the right way, everything will be fine, and if they aren't fine you must have done something wrong. All stuff that's not confined to parenting.
I have wondered if some things are related to kids being in care so much. Parents won't let their kids do things that used to be normal, like walk to school or play in the park, even when objectively it's just as safe. They figure the school or nursery has to keep eyes on the kids 100% of the time, and so parenting is seen as the same. There isn't much relief from constantly watching the kids.
Af far as feminism, motherhood is totally the unanswered question, and I suspect is part of the reason why many women lost interest in it as a movement. It seemed, apart from some niche writers, to totally get behind the capitalist drive to put all women in the workplace and monetise childcare. And more recently to not only push to give similar parental leaves for fathers to give families more support and optins, but calls to mandate that the parents must share the leave time because of an idea that women must not give up careers or jobs more often than men, in order to try and get rid of statistical disparities.
Women who weren't keen were given short shrift by feminists in many cases, and so their thoughts and insights were lost as they simply stopped being involved. But it's not been a great look to have so much come down on the side of the question that is better for capital, and also in many instances is a boost to class power for the professional classes but really not so much for working class or even lower middle class people.