... so we're charting new territory as far as sexual development is concerned.

I find extending childhood extremely problematic. To give you the chain of my thoughts: When you raise kids by the practice that everything else but biology comes first, you end up with adults who are at high risk to stay in an infantile state of mind, since they were put in the situation to avoid the responsibility to lead a household, to manage finances or the numerous other tasks like taking care of other family members.

The extended childhood leads easily to a false sense of entitlement and to adults who then, well over their thirties and forties, still expect their parents/or government to take care of their needs (and demands).

... I would not call it "new territory" though, but a territory in danger of becoming too narrow and closed up. One, which will be avoided on top of what we already got, if you allow children and teens to not only delay puberty but make it impossible through puberty blockers and irreversible surgery. And to take only their own word for it.

Let me ask you a question: When you were a kid and your parents said "no" to one of your whimsical desires, how do you judge it from your present perspective?
My question of course implies that the desires of the pre-pubescent are all but mature, since the maturity to become aware of ones self centered desires, is to undergo puberty in full. So that at the end of that painful process you built up enough self esteem according to your man- or womanhood. The brain of the child and teenager is not fully developed, either. Would you give them the responsibility to decide what "social gender" they want to be? Adults, who think that way, are themselves stuck in immaturity, I suppose.

... I think I might know your overall position, please correct me if I am wrong. My man (who you resemble in my mind), has the attitude to see the great picture and to have trust that things will balance them out. Still, you need something/someone to balance those things. While he is often enough right, he often enough is wrong in the detail (same counts vice versa). To spare the intimacies ;)