It's unclear what age puberty is "supposed to" happen. The age of onset of puberty has gotten substantially younger, even just over the past couple hundred years. If the "correct" age is what we see today, then there's thousands of generations of humans who had puberty naturally occur "too late" yet we're all still here to talk about it. If the "correct" age instead is when it used to occur, then everyone should go on puberty blockers for a few years to avoid this unnatural surge of precocious puberty.

> I don't understand what you're trying to claim, but ceasing the medications does not reverse the changes they made during critical teenage growth windows.

Puberty blockers do not themselves induce changes. They block hormones whose job is to trigger release of sex hormones which would induce changes. For young trans people, access to blockers can save them from a lifetime of dealing with the consequences of a puberty they did not want. Likewise, blockers can save a cisgender child from unwanted consequences of a puberty happening too early.

That doesn't mean "until adulthood", it could just be a few years. But even then, I think blockers are a compromise to appease people who doubt the ability of trans kids to make their own decisions about their bodily autonomy. I think trans people should be able to go on cross-sex hormones basically at will, but certainly after no more than a cursory chat with a therapist.