@Dangerous_beans I saw a (fill in) GP who asked me how taking progesterone was going and they were adamant that the only thing it can do for trans fem people is help with breast growth. I decided to agree and pretend that breast growth was the reason I was taking it, and avoid the weird, judgemental conversation that was taking place.
I was actually surprised, because I had just seen an endo who was adamant that there is no adequate science to conclude any benefits at all so they don't recommend it.
My sense is that doctors don't have time to stay on top of the slow and wildly complicated research about trans people and progesterone, so they go by what was understood 10-20 years ago - which is why the breast cancer thing persists.
Anyway, anecdotally it doesn't increase my libido (it wasn't my intention), it may have helped with breast growth (this is not good science), and a number of the other possible benefits I read about are unmeasurable so who knows what it's doing for me.
Back to puritanism though, I never actually thought about what the general population think we take it for. (Do they even know it's a thing?)
I still think GPs just don't really know, but I think you're right that whatever they do know is going to be filtered through a lens of some sort, and that could be puritanism, misogyny, or transphobia.
My regular GP is by no means an expert on this, but is happy for me to try it out to see what happens. And that's reassuring to me.