> 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.

The change over the past couple hundred years is measured on the order of a couple years at most.

This has nothing at all to do with hormonal intervention until adult ages. Once someone reaches adulthood the window for a lot of changes has closed.

> Puberty blockers do not themselves induce changes. They block hormones whose job is to trigger release of sex hormones which would induce changes.

You're either not understanding, or trying to avoid an inconvenient point: Once blocked during critical periods, many of those changes simply cannot happen at a later date.

Puberty cannot be delayed until adulthood and then resumed as if nothing happened.