The question was why create a female persona, which is different than advocating against having a handy female name to use as a handle.
I see a reason for creating a persona -- Most of us are in a state of flux in our journey of self-discovery and not at a stable end point. During the phase of self-discovery many people feel that there are two distinct personalities housed in their body. Over time, I think most of us come to accept that it's not the case, but until you have a chance to suss it out it provides a workable model. And there are some folks for whom that's a workable enough solution that they never seem to abandon it. I think part of the appeal of a second persona is like believing the sun goes around the earth: it seems to fit the facts at first. And vestiges of it may remain even after you know better -- we still talk about sun-up and sundown even though intellectually we know that's wrong.
For me personally, it was an interim model that I left behind but the name "Jennie-cd" is still around from that time even though I no longer use Jennie in the real world and even though I no longer consider myself a CD.