Because 9/10 thats exactly what it is. This isn't so much a criticism as it is reality. Humans are creatures of necessity, guys innately know they have to do shit to be anyone or have value (though due to being told otherwise we're having huge issues there aren't we?). Women don't need to do shit to have value in society, so they don't.

There are a plethora of anti-social men who are vigorously interested in a particular topic all on their own, without reinforcement of any sort. They'd rather be left alone with the topic then deal with others. For women, this is almost never the case, reinforcement is needed, incentive. For women it's almost always the chance to become embedded in a particular lifestyle/social scene and work within that hierarchy to satisfy their need for social mobility. Go figure, women have been going to college for decades now and we still need to "encourage" girls to be interested in comp sci or engineering. Meanwhile you have Tommy autism who the world is trying to crush into oblivion by telling him he's worthless and he's pursuing the topic in his off time.

The only fields I can think of on hand that women pursue by themselves is typically the arts--which I do enjoy. Women gravitate to literature at best and light reading in most cases. I see a lot of girls get into doing crafts and stuff, drawing, painting etc. Also, singing, theater, acting, those are pretty popular with women. These are usually the artsy types and are almost never "popular" girls depending on the niche. The truth is, most of these women are average in appearance or lower unless you're talking about rising actresses or people involved in a visual medium which mostly filters out unattractive people in general. Rarely will a very attractive girl be inwardly motivated to pursue a topic unless it relates to her own sexual prospects or social status. This is merely the drives that push us. Men are pushed to create value or die, women are pushed to secure their options so that they'll always have a fall back--that IS the game for them.

So for any guys here to be complaining or stating it with some sort of actual contempt towards women for being that way simply haven't accepted that the world has always been this way. They fight themselves. Women have always been like this--and yes, for the spectrum kids I'll mention that there are outliers, but outliers are outliers. This is the backbone between why you should find some thing to commit yourself to besides a woman, because a man who commits all his efforts to a woman is a man not creating value for himself, he's worthless.