But, those seem like really obvious things to point out. So, I guess I'm missing the majority of your point on this one.
My point is that it may be possible that in your quest to delineate what you perceive to be the realistic differences between sexes, you will create differences in characters which do not reflect expectations based on the real world. For instance, it would not be much like our real world if fighters are typically male while rogues are typically female. In the real world, women have been underrepresented in adventuring professions, and in fact in the majority of professions of important not related to domestic science or implied or actual copulation. If you want to delineate real world differences in activities, you have to make the game unfair to female characters. If you insist on some measure of "realism" but then you apply the "realism" in a fair way, you end up with a fairness which is unreal. In history, rogues, bards, and monks were not typically female, even though it's quite reasonable to suppose that women gain a bonus to Tumble and some sort of bonus to interaction skills that is favorable to them at least in some scenarios.
An increase in detail does not always result in an increase in precision.
In this case I am really struck by how different PCs are from average people. It takes a lot of storytelling to explain why women are not as often cat burglars, despite being more petite and flexible. We know that in the real world, most cat burglars have been men. We can pretty much toss realism out the window here. Reality doesn't agree with our limited model. Real world people are not optimized along the same dimensions as RPG characters.
Do you want PC fighters to be disportionately male? Do you want cat burglars to be disproportionately female?
Which brings us back to this: is there some advantage to the game in favoring one concept over another, based on gender? Is it better in some way than simply offering both conceptual differences as options, and letting the player decide which option best fits their character, irrespective of gender?
If, on the other hand, you want to be realistic, "fair" goes out the window. In the real world, some concepts do fit more neatly with nature. Men can throw baseballs. Women can do things on parallel bars. The mechanics of those tasks, specifically, speak for themselves. Thus, in D&D, it makes sense that men could carry more weight by Strength, while women are better at surviving famine... mind you, carrying stuff comes up a lot more often that famine!
There is a whole list I could make of things that men or women are NOT better at in an appreciable way. Neither is better at math in a consistent and holistic sense. Neither is better at multi-tasking, although women do it more often (meaning that men more often screw up by focusing when they should be multi-tasking, while women are more likely to screw up by multi-tasking when focusing would be more efficient). Neither has better "pain tolerance" whatever that means; pain has only a limited relationship to physiological distress; it is primarily a psychological phenomenon. The same woman who gives birth to three children might balk at getting her ribs cracked in a friendly game of football. Men and women both achieve in every art and science. Both succeed at almost all professions to some extent; I know a male midwife. Neither is more "right-brained" or "left-braineD" whatever that means; women tend to use more decentralized thinking, but A) that is only a typicality, not a universality (i.e. not true of all or even necessarily most men and women) and B) brain activity obviously involves strategy choices as well as physiology, and men and women are socialized to approach problems differently. Neither is more verbally adept, although women develop their conversational skills sooner and use them more as adults; women are not however better listeners. Women and men both are capable of anger, cruelty, and bullying. Although the top shootists are men, I can't discern any reason to believe women are not as good or nearly so at aiming and firing a gun. Neither is better at withstanding G-forces; women can (on average) take more acceleration change but men tend to have more upper body strength helping them withstand more acceleration absolutely; of course exercise softens both differences (cardio health for men, upper body muscular structure for women). It's doubtful they differ much in empathy, although women are often perceived to be more empatic.
A handful of actual differences: women survive famines better. They live longer. They are more flexible, and stay that way longer, on average. They are more prone to depression (although there are reasons to suspect social factors rather than physiology, or in addition to). Women can give birth. They have fewer sex-linked genetic disorders. Women can produce milk. Men have more upper body strength. They also have the ability to rotate their shoulders with more momentum. Men are more prone to schizophrenia, and autism. They not uncommonly inherit sex-linked genetic disorders like color blindness and male pattern baldness. They can impregnate multiple women. They have a longer stride. Men continue to grow in height and musculature well into their twenties, and could gain muscle even into their 40s if active. Men are capable of reproduction until almost the end of their lives. Boys are more kinetic when young, take longer to potty train, and develop vocabulary more slowly until later in life. Men grow beards and more body hair.
The only differences I would find even potentially
useful in a game, setting aside the cost-benefit discussion that has already been highlighted, would be men's greater lifting capabity and throwing ability, and women's greater stamina under extreme conditions and greater flexibility. .... That would be a wash for 3e rogues, monks, and barbarians, but would favor male fighters, male halflings, and female rangers.
I'm just not sure I see the benefit of letting women be Alluring, but not men be Dashing, each granting some kind of social skill bonus, or men be Powerful but women not being Agile, each granting some kind of melee attack bonus.