Fetish stories are different from a regular story that has a flow of setup-conflict-resolution. Even if the catfight fetish were an accepted one, this still would remain true. As such there's a difference between realizing one's own fantasies and composing a story.
It's a bit closer to writing for an orchestra where you expect certain instruments to compete with each other, but at the "end of the day," it's a human who blasts a horn or pulls the strings. It's wise to know how far they can go to create harmony.
For a very long time, this fetish world on account of disposable income was ruled by guys, and from a technical standpoint, it's easier to write for men as mostly they look for something for the "spank bank", where the deposit can easily consist of stock characters. Women on average are invested more in the characters, in their individuality, in the sensual aspects.
Therefore I do support that stories are written by others for a multifactor of influences, chief among them is knowing in what we may differ. I grew up in a police state that actively persecuted pornography, and individuality in general, so it should come as no surprise that there was no sexual revolution either.