Right, but the idea that women want everything in one man as the ideal is one idea the manosphere and Blue Pill society at large have in common

IRL that hasn't been my experience (both firsthand and observed) at all--at least not long-term. Some women are more monogamously inclined than others--and most girls will be monogamousish at some point and will want a wedding, but I think a lot of that is just social conditioning, social pressure, and the fact that until recently women haven't had access to as many high value men. In the past, it was a lot easier for her to optimize her hypergamy in one man; perceived value is always relative. I think most girls find it possible and often preferable to get better provisioning and better Alpha from multiple sources, whether that's split over different seasons of her life or concurrent. I think the idea that women aspire that optimized hypergamy in one man as a rule serves male reproductive goals (assured paternity and ego) more than it does women (as long as they have someone to take care of the child). No one on either side of the pill is entirely free of ego investments.
You've got your notions about societal conditioning of women completely back to front.
The idea that women are actually natural-born slvts, and are just socially conditioned to be monogamously-inclined, is the real male ego fantasy. Women are hypergamous, which is an entirely different thing all together.
Men want sex with as many women as possible.
Women want sex with the highest value man she can find.
Men Display, Women Select.
The reason women are able to have consequence-free sex with lots of Chads is because of birth control and abortion. That's the real "social conditioning", otherwise you'd see women being far more selective.
The downside of this social conditioning of women is that birthcontrol and abortion royally screws women up hormonally and mentally.
Women will have sex with Chad (stupid term btw--have yet to run into him infield in any stereotypical sense), just for sake of having sex with Chad. Attraction is not a choice. And many of these women don't want to be locked down (though they might give it the old college try from time to time)--granted I have limited experience with any girls over 22ish.
Chad is just a term for a man that is a woman's top choice for sex. You possibly haven't run into him because he's a rare top 1% man (true SuperChad).
Attraction is not a choice for either men or women. However, Men's standards for sex are much lower than women. Women have much higher standards when it comes to genuine validational sex (looks, money, status, Game etc).
A girl has her peak SMV from 18-25. She's not going to settle in the open market at that age. She's in her party years and has access to all the Chads (as long as she's thin). These are the years that she'll develop 1000 c0ck stare too - jaded and unable to pair-bond.
Again, I think you're confusing social pressure with nature. When that social pressure is removed, you get a very different picture. And you have to ask why that social pressure existed in the first place.
Why have women evolved a hymen? Are hymen's "social pressure"? Are massive oxytocin releases when a woman has sex "social pressure"?
Again, the real social pressure is actually encouraging women to be slvts. Ever heard of the term "slvt shaming"?
Other social pressures include easy abortions, hormonal birth control and shaming motherhood.
The Coolidge Effect is also a well-known phenomena--most of the chemical ****tail that results in monogamy lasts 2-5 years (used to know a more exact figure), just long enough for the child to walk... In the past, most people didn't live past their early thirties.
That said, there are major evolutionary advantage to dual parental investment. I'd say overall humans walk the line between r/K selection--with evolutionary traits of both tournament and pair-bonded species--and that behavior often manifests itself in a single person over the course of the lifetime, though members of both sexes swing one way or the other.
The mother then bonds with the child. If a child isn't produced then the c0cktail wears off. This evolved so that women didn't pair-bond with sterile men. When a woman gives birth then a new massive dose of oxytocin is released so she'll bond with her baby.
Women are designed by evolution to continuously get pregnant up until her late 20's, early-30's.