I do think some women are so hell-bent on the idea of "independence" that they will literally cut off their nose to spite their face.
I'm not talking about specific examples on here because it's none of my business. However, in most relationships, it still tends to be the man who is the higher earner. Even if not initially, it tends to evolve over time as women tend to be the ones whose jobs / income are more affected by children.
Yes, I know people will come in now and say they only took 3 weeks off with each baby and got them in nursery asap, but I am talking as a general rule.
So where there are separate finances, who is generally benefitting? The higher earning DH or his wife?
It also tends to be the case that women spend more time with the kids - either because they are SAHM, part-time or feel as if they have to get home quicker for pick-ups. So it follows that more of "their" money will be spent on day to day stuff for the kids. Then the DH can still act magnanimous by paying for the "big important stuff" beyond the everyday.
If I had children with a man and he didn't INSIST on me and HIS children having direct, daily access to his income, I don't think I could trust him in a marriage because it would I would not feel valued, respected or equal.