Gender dysphoria is not about lacking a hormone. People born a man with 100 percent of the testosterone they 'should' have, can still have a total need to transition to Female. Giving them more testosterone won't help.
https://testosteronedecline.com/testosterone-levels-100-year...
> As you can see, average testosterone in the USA was something like 625 ng/dl in the 70’s, until the early 80’s. This is reasonably high testosterone. But since then it has been falling steadily.
> For the average American man in the period of 2013 – 2016, testosterone was 420 ng/dl. (source)
The suggestion I'm making is therapeutic - it is supportive of the biology of the person who is suffering with a unbalanced hormones. At the end of the treatment I propose, it remains a possibility that the person can live a normal life, being able to reproduce etc - as opposed to becoming sterilised.
As for whether preserving fertility (banking sperm or eggs) before starting hormones (as teens or adults) is a worthwhile tradeoff on an individual level, that's a choice for an individual to make. In no circumstances is it not abuse to force more of natal hormones into a trans person already harmed by them.