i probably fall in that same camp with you, but the conundrum the documentary is centering on is how the rates of suicide and other issues absolutely skyrocket as puberty hits. apparently the current (not research-based) strategy is to give the kids puberty "blocking" drugs for a couple years to see if they grow out of the transgender sensations**.
Example: 11yr old biological girl spends ages 2-11 living as a boy because she's adamant that she's actually a boy. Parent takes her to the pediatrician, psychologist, etc and is told that 90% of kids outgrow this sensation and progress through puberty normally. The other 10% don't outgrow it and end up being highly prone to suicide, domestic violence, poverty, etc. You're told that the risks of those adverse outcomes is greatly reduced if the child goes through hormonal reassignment before puberty rather than enduring the psychological distress of puberty, high school, etc. As she turns 12 and starts to develop breasts, she turns frankly suicidal and antidepressant drugs, etc. aren't making any difference. What does the parent do?
The documentary is also really emphasizing how there's next to no research on any of this stuff and what the proper interventions/preventions would be. Also, while many of the drugs have been on the market for years, they've never been studied for this particular use.
**full disclosure that I know nothing about this shit and am probably using the terms incorrectly