But giving hormones to children (who may not recognise the future repercussions of their childhood decisions) to prevent puberty etc is not psychological or physical abuse? How is that not active, literal abuse?

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.

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.

In general, prior to using any hormone-altering drugs, they will have the usual range of hormonal levels in accordance with their sex.

This idea that the trans-identifying have the 'wrong hormones' and all that is essentially just a cult-like religious belief.

Looking at it from a perspective grounded in material biological reality: they desire to be the opposite sex, which isn't possible, so instead take hormone-altering drugs in an attempt to mimic some of the secondary sex characteristics that develop naturally on individuals of the opposite sex.

That's it, no magical thinking required.