It seems advocating for a systematic advocacy towards the greatest long-term control over ones own body, might be a position that would be fair and also supportable by the largest segment of the population.

This would strongly prioritize reversable changes over non-reversable ones as you advocate in your article. If long-term control were the bedrock criteria, then Tucker et al. would have a hard time arguing one is choosing for the child/teenager.

I like your frameing around initially viewing such indications from your child as a "phase". This takes the heat off of the situation. The parent who might not be fully ok with it, and downplay its importance... and the child/teenager who is figuring it out, can do so in a less pressured way. Reality will sort itself out eventaully, and mistakes wont be made.