A marriage is about finding a person who fits with you, and you can build a life together. That is not the same person for everyone. My best partner is not the same as your best partner.
You say that "a marriage is about finding a person who fits with you, and you can build a life together". So take the viewpoint from a pragmatic woman's perspective; wouldn't these aforementioned traits be desirable because the man who possesses them is a candidate more likely to provide the best life to build together?
Second, there are a lot of other traits that aren't inherently good or bad; things like "do you like going out on the weekends or staying in" and "does your communication style work with mine?" and "are the things you are good at complimentary to the things I am good at?"
My best friend and his wife get along great, but both my wife and I can't imagine living our lives like they do. I am sure they feel the same about us.
This thread has been discussing the implications of the observation quoted in the article: "Sexual activity was largely unchanged among unmarried women, along with no notable decline among gay men, researchers reported."
So it's unclear what point you're trying to make in relation to that.
The guy who is among the top 10% of men is the one who is good enough to party with AND good enough to marry. However, though this guy has a plethora of women at his disposal, he can only select one for marriage.
For the women who weren't chosen, their first choice guy is no longer an option, so they have to settle for a plan B (that is, a less desirable man).
So even if you were "good enough" to marry, you weren't first choice in that either.