I think they are popular with the most vocal trans rights activists because it validates the belief of trans women that they are real women if they get to use the women’s facilities - and their validation and feelings matter more to them than the safety, comfort or dignity of women and girls.
Basically the biological females are supposed to be nice, and accept these trans women in our spaces despite the fact that 90% of them have had no surgery at all, so what we are being asked to accept is people with penises, in our most intimate safe spaces!
Look at J Yanniv - a fully intact male person who says they are a woman and wants to lurk in the ladies loos, in the hope of seeing a tampon string hanging out of a girl’s vagina, so they can have a conversation with them about tampons, or worse, wonders whether, if they encountered a young girl who was going to use a tampon for the first time, they could offer to help the girl insert the tampon!!
Or the trans woman who boasted on Twitter about how uncomfortable they made women in a shelter, by parading around with their naked penis out. Not someone I want in the loos with me or with vulnerable women and girls.
Or the trans women who go into the ladies’ loos and take used sanitary towels so they can wear them - to feed their delusion that they are menstruating!