https://www.nytimes.com/interactive/2015/04/16/upshot/marria...
High income couples are actually penalized, and even worse off once they have a child!
It's slightly easier to get a large loan or mortgage as a married couple, but it's not exactly impossible if you just live together as partners.
The way I see it, it's an absolutely enormous expense with almost zero financial/economical benefit for us. I love my partner and want to get married because I think that's the right thing to do, but if I looked at it outside of the "romantic/traditional" angle, there is absolutely no reason to get married.
You also benefit from spousal privilege, meaning you can't be compelled to testify against the other. Although, depending on your criminal inclinations, that may not be a strong reason to get married!
You all make it sound as if stay at home women was the norm, but it is not the case.
Looking at my friends there's a pattern, a man who loses his job long term becomes divorced quite quickly. So there's no added safety for the man and no economic incentive (or even a disincentive, not sure how bad it really looks for men losing everything in court).