Oh I get it now.
First, women should have a magic arsehole detector to know in advance if a partner will turn out to be a useless dad (yes, sometimes there are clear red flags but not always). If someone who seemed basically decent before turns out to be an arsehole, that’s the woman’s fault.
If dad isn’t doing 50% of all household things, that’s mum’s fault for not forcing him or accepting too little, having low standards etc. She should simply refuse to do more than 50% so he has to step up.
Oh, but she needs that future-seeing magic again, because if it turns out that he actually doesn’t respond to being expected or forced into doing his share that’s also the woman’s fault because she should have realized that he was such an arse he’d rather have his kids neglected and possibly removed than properly parent them.
And if she uses her judgment to decide she can’t force him into parenting and has to do more than 50% herself we’re back to calling her weak and saying she simply has to force him to step up, yes?
If he’s useless she should leave (which obviously doesn’t solve the unequal responsibility problem, he can still be an arsehole once they’ve split), and if it’s financially not viable to do that at a moments notice that’s also her fault because only rich women should have children, no change in her circumstance is permitted, no cost of living increase or at least she should have foreseen that, no impact on her career from having kids because oh yes she had to force him to be an equal parent…
it’s all very well to say how things ideally should be but at some point it’s just insulting to ignore the complex reality.