Blocking puberty in children is not a novel use of puberty blocking drugs.
It is an procedure distinct from the mere delaying of precocious puberty.
In other words, it is very much in line with being cautious when it comes to children's healthcare, and any theoretical downside of taking the medicine needs to be weighed against the downside of abstaining from the only medication used to treat gender dysphoria in children.
Being a woman sucks, physiologically, compared to being a man. You have more heart attacks; you have brittle bones; you're weak.
But is that worth incurring if it means you don't kill yourself?
The reality is that our legacy biology is a clown show. The real and durable solution is to go posthuman. Until then, it's hacks upon hacks.