> Perhaps you say, but why in the fuck would you ever want to?

This sounds to me like a faliure of creativity on your part. "I can't think of a reason why someone would want to not go through puberty, so nobody should ever be allowed to do it!"

And if we follow through the comparison to the other side: "I can't think of a reason why people would want their bodies to not gradually break down and become unusable"? L O fucking L, that's all I can say.