I would imagine a large part of it being that the popularity of it is relatively new. https://williamsinstitute.law.ucla.edu/publications/trans-adults-united-states/ states that 1/5 are under 17.

Another reason likely being that the general population of ftm is low, as mtf contrasted with ftm is 2:1.

Another reason, as previously stated it makes certain demographics uncomfortable.

And my own anecdotal experience, they aren’t super attention seeking. Just want to live life, not in a spotlight.

Anyway just my thoughts. I’m just some moron on the internet.