true, but if I had to guess, I'd say in the circles rp and fandom pull from, "woman who have had some sort of emotionally negative relationship with another woman" (whether in a romantic or other way) probably rates higher in frequency than the same situations in male/female dynamics, and waaaay higher than male/male dynamics.

So you have a bigger chances of a trope hitting close to home in some one's real life, and then less characters, creating a smaller pool to be aiming for in the first place. I also think it's a lot of why you have seen things getting better in regards to ALL FF, since people can signal boost and share female characters they like, which is making more get created.