I personally do not believe that's true in most situations, and throughout the years, I've probably looked at over a thousand divorce files. One you are married, you become a union. The idea is that all assets and liabilities gained throughout the marriage should be split 50/50. Yes, sometimes the wife doesn't make as much or even work, but in a rational marriage, the wife should be making up that discrepancy in other areas such as childcare, cooking, cleaning, etc.
I'm in a fairly working class area, so what I see often is a husband who gets married early, has the wife stay home with kids, and has the wife take on a total traditional role of cooking, cleaning, taking care of kids, etc. A real alpha guy right? Honestly, it's the exact opposite. They get divorced, she gets half of the assets (which she should), and the dumbass has no idea how to even feed himself or manage a household. That's on him.