I think the best example of why it's better to have women direct movies focused on a woman or women, is how Harley Quinn is handled in the first Suicide Squad movie vs how she is handled in Birds of Prey, and the Amazons in Wonder Woman vs the theatrical version of Justice League.
Yes, men have made good movies and TV shows about women, but they are still approaching their stories as outsiders, and don't have the kind of insights into being a woman than a woman would have.
And to go back Whedon and Buffy, it's worth keeping in mind that the show had several women as writers and producers, so there we did get the authentic female perspective on the show.
I've been working my way through Neuromancer and Eye of the World, and William Gibson and Robtert Jordan are perfect examples of men who clearly had no idea how to write believable woman. Some of their scenes with women characters are almost hard to read, especially after reading books in the Kate Daniels and Desert Cursed series, which were both written by women.
So you think a rigid class system is the way to go?
You remember that it was a woman, Marti Noxon, who so enraged the cast so much, that they walked out and quit?
It's only because of lawyers that they were all forced to come back for the last season, after Joss Whedon calmed everyone down.
See!
He's good for something.