YABVU - I also find it hard to believe that you have put forward your suggestion in good faith because there are so many contradictions in your posts.
One example of your contradictory statements that are key to this discussion:
Jargoyle said
"I consider myself to be a massive feminist."
also Jargoyle
"I don't identify as a feminist"
I am not sure if this next one is a contradiction because it is not clear if you consider yourself to be a "GC poster" or, as you so charmingly put it, "normal".
Jargoyle - "I'm gender critical"
Also Jargoyle - "GC posters are usually all over any thread to do with gender, whilst a lot of normal posters won't have given it a second glance."
So which is it? Are you "gender critical" or "normal"? 
If you are a "gender critical GC poster", why are you complaining that there are too many gender-related threads on "Feminism Chat"? Surely you would be right in your element and enthusiastically contributing?
Also, in what way are GC posters are not "normal"?
I will give you the benefit of the doubt and assume that by not "normal" you mean, "not representative of the majority of women who are interested in topics to do with Feminism and Women's Rights".
The evidence of posts to FWR suggests the opposite, ie. that "GC posters" are the norm.
The reason is obvious.
To quote TheInebriati in this thread:
"Whether or not women are permitted to exist as a distinct legal class is the fundamental human rights crisis of this decade.
Everything else comes second to this. Everything includes the effects of austerity, the cuts to the NHS and women's services, and the crisis in education.
All of these risks to the well being of women and children are entirely artificial and driven by a controlling agenda that seeks to remove us of our existing rights. those rights were not just handed to us on a plate; women had to fight for them, and events today give us some insight into why that was and what an uphill struggle it must have been.
If you don't understand this then you don't understand either human rights or safeguarding."
As others have already pointed out:
- it is very easy to increase the range of topics covered in "Feminism Chat": if you want to discuss something relevant to Feminism and Women's Rights and it is not already being discussed, post a new topic.
- there are other Boards in FWR - have you checked to see whether the topic you are interested in is already being discussed in Feminist activism, Feminist book clubs, Feminist support or Feminist theory?
To you and everyone else complaining about women discussing "Gender Identity and Sex" on "Feminism Chat":
Why on earth are you wasting your time posting on this thread in AIBU when you could be starting new topics that you are interested in on "Feminism Chat"??
Hard to think of anything less reasonable TBH!