Earlier quoted context omitted.
I agree that it sounds uncomfortable for a child to make just a permanent life-changing decision like that, but the counter point is that transitioning is significantly easier on the body and mind before puberty happens.
It's definitely a catch-22. In the vein of 'do no harm', I'd tend towards delaying it, even though it might be harder later, rather than proactively pushing a treatment that will later be revealed to be a mistake. It's too hard to present the options to a child without putting bias and pressure on them.
I agree on the value of delay. During childhood, we all wanted to be firefighters, police, the president, and astronauts. We don't start those children down a permanent path based on those choices, we (mostly) let them become adults before locking down career paths.
There are some exceptions to these rules, of course. One in particular is athletes. Society happily will fundamentally alter a child's or adolescent's body in pursuit of athletics.