yo, one thing about actually abolishing oppression towards us trans people: it requires not putting any specific puberty above another. All puberties are permanent, not just trans ones.
We have the ability to sit every person down before puberty and talk them through what it entails, and then let them choose what exactly they want to go through. Making it an explicit choice places trans and cis people into the same situation.
Even with zero medical barriers to transition once someone realizes they are trans, the social barrier of what you are "expected" to be is an issue, for multiple reasons. People who want to make big changes are often questioned and forced to prove that what they want is what they “actually want”, because it deviates from what is expected. People who deviate in smaller ways are punished in their own ways, with those deviations being treated as mistakes or failures, because another major role can't be easily assumed. They are pushed to drop everything that is not perfectly aligned with the role to not be constantly torn apart.
We have the technology to provide agency, not allowing its use is oppression. The only way to abolish the hierarchy around puberty is to abolish expectations around puberty.
If you think a child doesn’t have the ability to decide what puberty they want to go through, forcing them into a random one isn’t better. If they can’t say no, then they definitely can’t say yes.
People will always know themselves better than others do.
Yes, a lot of physical or culture genocide is perpetuated through 'socially acceptable' behaviour, so you're not at all incorrect.