I generally agree, but it is a problematic question because even short of operations there are things like hormone treatments that, during development, can have lifelong impacts. Children lack experience and context that may help them make the best possible decision but on the other hand if they forgo treatment until they are a little older & post-pubescent then they may have lost forever a significant opportunity to develop their body in accordance with their wishes. But the same problem can occur if obtaining hormone treatment during critical developmental periods does not ultimately coincide with their identify.

I don't have an answer, but perhaps we'll gradually better understand these things as time goes on, though doing so will require taking a step back from political or ideological thinking on the topic.