Gillick is for when there is a clear treatment pathway that has well-understood benefits and potential downsides. Children were being given treatment when it wasn't understood what the effects were, which impacts whether informed consent can be given.
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No, not for the same effect. Most commonly in the case of a gender dysphoric girl, they've already started their periods and the Lupron throws her into immediate menopause, with all those symptoms. There is no evidence that puberty resumes when you stop it from age 14-16.
That's an argument for using it earlier- which I believe is the best practice, to use at first onset of puberty (2 yrs on average b4 1st menses). But the decision stops it being used that young while allowing it for 16 plus. Surely that's not logical at all.