If by "weakness" you mean something that balances their advantages so that the system is "fair" like a video game them no, they have no weaknesses. The system isn't remotely fair.
But if by "weakness" you mean a flaw that prevents them from achieving their longterm goal, then yes they do have a weakness. I don't think there's a single word to label it, but essentially they are set up for failure and most of them will not achieve a happy life
even though it would have been easy for them to do so.
Their age is a huge factor in their overall value. An average girl just entering the dating market at around 18 has an overall value of at least 8. I know it sounds strange to say "an average is an 8" but I'm saying she's average in her cohort of 18 year olds, but she's an 8 if you compare her to all women.
Her "weakness" is that this value declines rapidly. Within five years she has declined to a 6, and by the time she's thirty, most women are 5 or below. More to the point, the weakness is that she's going to live for 90 or even 100 years, but she has only 10 years, only 1/10th of that time, to have this high value.
- She is not aware of this fact (literally nothing in society explains this to women) so she will waste those 10 years
- The choices she makes during those 10 years set her standards so high that she can never be happy with any many she gets afterwards
The winning strategy for an average 18 year old girl is to marry an average man a few years older than her who is sufficiently ambitious and hardworking that he will be able to provide a comfortable life for her and her offspring. She should give this man children in her 20s, and encourage and support him in his career.
By the time she's 40, her value will be 4 or less, but her husband's value (due to his income) will be 6 or 7. With that income, she can then cruise through the rest of her life on easy mode. She'll experience substantial happiness from her children. She will have pair-bonded with her husband, and he with her so she'll feel loved. She'll eventually have grandchildren in her old age = more happiness. She can pursue a career, if she wants to, but that's option and so it wont stress her out. And if her husband betrays her (because now he's capable of getting a younger, hotter woman), the government will protect her with a divorce settlement (half his shit) plus alimony plus child support.
...unfortunately, few women discover this strategy.
What she'll actually end up doing is wasting her 10 year window. She'll bang Chads who are 8s, 9s and even 10s, and she'll collect "standards" from each one. One of them is tall, so her standard will be "I only date 6'2" - another will have a huge dick so her standard will be big dicks - another will be rich - another will be low-inhib or generally crazy, but that will be fun and adventurous to her so that'll be her standard too.
She wont even ask these men for commitment until she's at least 25. It will have been so easy to get these men, and they will have been so plentiful, that she will assume she can get commitment at any time. So, she'll "have fun" and "explore" and "find herself" all of which are euphemisms for promiscuity.
Between 25 and 30, she will start seeking commitment and will be frustrated when she cannot get it. She will begin limiting herself to only men who say they'll commit. Some of these men will lie to her, others will have been willing to commit, but they wont like her personality. She'll even break up with a few of them herself. Any of these outcomes just means more time wasted as her value slips lower and lower and the value of the men she can attract goes down too.
She will use the word "settling" to mean lowering her standards to the level of men who are actually willing to marry her. But given that her expectations, set by years of banging Chads, are a collection of attributes from dozens or hundreds of men ... there is zero probability she will be happy with an average guy.
But she probably will get married anyway. And she'll probably have a kid. But she will never really love the man she married. She just wanted the wedding day - the big party. And she'll never find happiness through her children, because she never focuses on them.
She will have to have a career. It's not optional. She will burn out in this career and be stressed, frantic, depressed, and deeply, deeply unhappy. She will get divorced, her kids will be assholes, and she will never again be happy trying to date.
And that will be the story of her for the next 50 years.
That's their weakness.