Women have always had inherent value owing to their ability to birth children. By contrast, men have always had to accrue value unto themselves by their works and deeds. I think this fundamental reality is reflected in our media depictions of male versus female protagonists.
The hero’s journey is essentially the coming-of-age story of boys becoming men via trials and suffering. We become worthy of our stations in life, and our women and our families, through accomplishment and overcoming challenges. Or we fail, and we die, literally or spiritually. Either way, it’s interesting.
Women don’t experience the same climb. They begin the game with tremendous, society-sustaining value. It literally cannot be overstated. It is, however, automatic and requires no effort. There’s no progression or arch or triumph. The only potential for drama is the tragedy that results when a woman squanders her greatest value.
Injecting women into traditionally masculine “hero’s journey” stories is a recipe for boredom. Because women begin the story with all of the value they require to be accepted and promoted by the tribe. Whatever motivations are concocted for these female protagonists are inevitably shallow and pointless. Their arcs are flat and uninspiring. The most they can muster is obnoxious and entitled subversion; they rebel against the “unfair restrictions” placed upon them by nature - as if men are so privileged in their mandatory pain and labor.
I think this theory maps pretty well onto modern girl boss characters. I’m sure it has been explored. Just connecting my own personal dots on this one.
The other reason it's fake is that "overcoming your own fuck ups by effort and grit" is much more of a male value than a female one. Not to say that women can't do it, but their usual response to "overcoming their own fuck ups" is to find the nearest man to fix it for them. So people can sense that female "hero's journey" stories aren't that realistic.