Man I have to disagree on the heart example. One means death if it's not 'treated' and the other is a life choice.
Of course pre-hormones is a great time to start but for external / appearance reasons. Do we not force body types on kids enough? It's shallow thinking and reinforces the worst parts of society.
I do understand the urge to just dive into it but it's not as clean cut as just "push pause." There are known risks, unknown long term effects, and a lack of sufficient testing on how it affects brain development. We need to stop rushing into shit just because it's easy or highlights how virtuous we are.