QOL indicators are pretty much the sole available metric for the success of care procedures like this. Suicide and self-harm also reduce significantly, which is not just self-reportage-- and that includes comparisons with 'control' groups of those who haven't undergone gender affirming care.You do not have that. You have short term self-reported data with no control to compare to. "We asked people who made major life changes if they think they made a terrible mistake, and they mostly said no" isn't data and research.
So, you want to judge the success of a care procedure aimed at improving QOL... while simultaneously dismissing QOL indicators as valid evidence. So far, so unreasonable. What do you want us to go by instead? You want us to be guided instead by your iron-age superstitions?