This suggests a narrative that is both inaccurate to the reality of the situation and disingenuous to the data we have. Regret rates are very low (<5%) for individuals who undergo hormone replacement therapy or other gender affirming therapies: https://www.genderhq.org/trans-youth-regret-rates-long-term-mental-health

Furthermore, doctors aren't hesitant to prescribe gender-affirming care because it's "forefront" or "experimental" and they don't want the risk. Doctors who don't want to provide gender affirming care are uncomfortable with it because they're uncomfortable with the concept of trans people to begin with. Trans people in the US get refused not only gender-affirming care, but also general care at a staggering rate (>40%): https://www.americanprogress.org/article/protecting-advancing-health-care-transgender-adult-communities/

This narrative frequently parroted about how minors shouldn't have access to gender affirming treatments because they're going to regret it later is also indicative of a lack of understanding of trans people as a population. People don't just "trans their gender" on a whim. Even as an adult who openly identifies as transgender and is socially accepted the act of going on hormones can be extremely difficult. People don't change their entire social identity and open themselves up to mass discrimination and bigotry for a kick, they do it because it's the only way for them to live.