WPATH: The World Professional Association for Transgender Health (WPATH), formerly the Harry Benjamin International Gender Dysphoria Association (HBIGDA), is a professional organization devoted to the understanding and treatment of gender identity and gender dysphoria, and creating standardized treatment for transgender and gender variant people. (https://en.m.wikipedia.org/wiki/World_Professional_Association_for_Transgender_Health)
HRT: Transgender hormone therapy, also called hormone replacement therapy (HRT) or gender-affirming hormone therapy (GAHT), is a form of hormone therapy in which sex hormones and other hormonal medications are administered to transgender or gender nonconforming individuals for the purpose of more closely aligning their secondary sexual characteristics with their gender identity (https://en.m.wikipedia.org/wiki/Transgender_hormone_therapy)
They recommend low dosages which can be more harmful and less effective, recommend against treatments when they really shouldn't, and dangerously favor certain drugs over others. Trans people basically have to advocate for themselves and know more of the science than their doctors to get proper treatment.
They just don't minimize costs and maximize benefits of treatment, taking the common attitude that sees external hormones as harmful by default. This a broader problem for all hormone treatments, with the medical community being hesitant to provide effective treatment to people postmenopause and others with hormonal issues. The old guard was taught a certain way and are hesitant to adjust with the times. Research moves too fast for them to keep up, so we basically need to wait for many of them to die or retire.