You're wrong. Trans people don't have unbalanced hormones, they have normal amounts of the wrong hormones, both as teens and adults. Puberty causes irreversible physical effects with lifelong psychological harms, and forcing more of the wrong hormones is even more harmful. And in the vast majority of cases, people during and after puberty who are harmed by natal hormones, continue to be harmed by them throughout their adulthood. You don't know better than trans people what their needs are, so stop trying to convince people to poison them by overdosing them on hormones which will cause bodily changes (skeletal changes, voice dysphoria, hair loss) that traumatize them for the rest of their life.

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.