The trans community seems to be demanding that HCPs ignore basic biology and treat them according to their chosen sex
This is arguably the most dangerous aspect. Because the key usefulness of categorising by biological sex is in applications where biological sex is most relevant - the healthcare setting.
I'm sure most transpeople manage their healthcare effectively, and flag with HCPs where various diagnoses, tests or interventions are perhaps appropriate or not. I'm sure a small minority will sacrafice their health on the altar of gender.
But meh, none of my business for those individuals. If someone wants to argue with a doctor that yes, ovarian cysts are a possibility, and no, he is a man, and no, he's not going anywhere until the doctor uses the male pronoun, whatever.
I DO wonder about the 21st century spike in female prostate cancer though
. An alien analysing the medical history textbooks might think that females had somehow evolved a prostate. That's fucking over epidemiology, and skewing stats to create a picture that simply isn't true, and therefore dangerous for others who might not buy into the gender construct.