I bet there isn't even a non-trans thread, that contains any sort of feminism, with more than 200 posts in the last month.
The trans issue encapsulates everything that's wrong with society's attitude to women - that we must budge up for everyone, that our opinions don't matter, we should just STFU and it's out duty to be nice and make everyone else happy, even if it's at a cost to us. So of course it's the main topic in the feminism section. 100 years ago the main topic would have been the absence of voting rights for women. That's just how it goes, we talk about what impacts on our rights and safety.