Because of what gets covered becomes a political question and those who make the decision are from the Clerisy with the “right” credentials. So in this world paying for sex change operation > expensive experimental treatment.
Not so experimental, well established.
Christine Jorgensen (May 30, 1926 – May 3, 1989) was an American trans woman who was the first person to become widely known in the United States for having sex reassignment surgery. Jorgensen grew up in the Bronx, New York City. Shortly after graduating from high school in 1945, she was drafted into the U.S. Army for World War II. After her service she attended several schools, worked, and around this time heard about transitioning surgery.