You named 6 of the companies among the 1000s of Porn Studios....And most of them are more Distributors who make their own limited content to Distribute than Producers who make all the content released under their Label.
Here is a list of Female Porn Directors. Some pretty big names in there...And it's far from a complete list
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Did you know that
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is a featured Director for Vivid?
I would hardly call her over the hill past her prime...
I suggest you check the credits of who is directing some of the films those companies you mentioned put out.
You might be surprised!