Edit: I think I've misread this comment chain, but putting my comment back now
These drugs have been used on cis children for non trans related conditions (such as precocious puberty in young children and some hormone-sensitive cancers in adults) for a long time and their effects are well known and fully reversible.
The use of puberty blockers in transgender youth is supported by twelve major medical associations, including the AMA. The people who take them are always, by established protocol, made aware of their major and side effects in relation to their own goals and self perceptions with regard to gender.
On the basis of the forgoing, trans healthcare is considered life saving by a vast consensus of medical professionals.
Now let's hear your side of this totally good faith discussion you've been talking about.