Why do doctors refuse 'tubal ligation' to women <30 due to potential regrets, but perform gender reassignment surgery on minors?

Those doctors who are so concerned about potential regret in adults seem so eager to tear off children's genitals.

Why do doctors refuse tubal ligation to women <30 due to potential regrets, but perform gender reassignment surgery on minors?
Why do doctors refuse 'tubal ligation' to women <30 due to potential regrets, but perform gender reassignment surgery on minors?
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