You are flat out wrong I'm sorry. I'm not asking this as a gotcha but as a sincere question, do you actually know any trans people in your life? Beyond having been an out transwoman for over a decade the vast majority of my social circles are naturally trans people and I have never met anyone who expressed anything but a desire that they had been able to transition earlier and not go through the disastrous effects of the wrong puberty.
The phenomenon of De-transitioners are a vanishingly small number of people who transition and the vastly overwhelming majority of them de-transition or experience regret due entirely to societal issues outside of our control (institutionalized violence, work/housing discrimination, familial ostracisation, social stigma and constantly having to defend our rapidly diminishing access to health care and right to even exist) most respondents stress that in an equal world they would continue their transition.
FWIW I have known who I was since I was 7 and it hasn't wavered for a day. I attempted suicide multiple times before transitioning and haven't ONCE since getting my first round of HRT despite the fact that my life is materially probably in a much less stable position due to unrelated factors. Every serious study done on Gender Affirming care shows it is not only the best way to manage Gender Dysphoria but that alternatives amount to having the same disastrous outcomes as conversion therapy.
Why is a kid who is sure they are cis at 11 valid and encouraged to play physically punishing sport, go to the gym, learn to box whatever they want in pursuit of those ideals (stuff that can do way worse damage to your body at a young age than blockers which have been shown to be completely benign with no long term effects in the vast majority of cases) valid in making those decisions but an 11yr old who is sure they are trans 'not capable of making that decision? Surely by that logic we should just label every child as agender until they are an adult and then they can decide for themselves? You can stop taking blockers, you can't undo puberty.
Trust me as someone who has actually BEEN THROUGH the very process you are describing that is SO not how it works. getting HRT especially in your country requires numerous visits to mostly hostile GPs, therapists and other people who at any point can and do knock you back to square one and thats without even touching on the YEARS long wait lists to even get that first appointment.
Doctors are not waving puberty blockers are kids that dont specifically request them, it just doesn't happen outside of the unsubstantiated anecdotal evidence springing from places like Mumsnet and other GC circles with a vested interest.