Non-binary people and medical transition.

There is a misconception that nonbinary people are "fake trans", don't transition otherwise than socially, or detransition. Here's what I can say on this issue.

This is the only study that focused on brain differences between binary and nonbinary people that was conducted, and it validates their existence:
https://www.ncbi.nlm.nih.gov/m/pubmed/22364652/

Here's something on how they transition:

"Chest surgery for nonbinary patients comprises a considerable proportion of transgender surgery practice"
https://www.ncbi.nlm.nih.gov/m/pubmed/30007346/

"assigned female at birth non-binary people, who do not feel themselves to be men, are, in increasing numbers, using exogenous testosterone."
https://www.researchgate.net/publication/334777012_Reworking_Testosterone_as_a_Man's_Hormone_Non-binary_People_using_Testosterone_within_a_Binary_Gender_System

"Finally, the only study analyzing the effects of medical interventions on health of NBGQ individuals (i.e., third research question) found that NBGQ FAAB individuals, contrary to the belief that they would not need to medically affirm their gender, improved their quality of life and health after chest surgery (Esmonde et al., 2018). This result is in line with previous studies which found that both hormonal treatment (e.g., Newfield et al., 2006) and chest surgery (e.g., Agarwal et al., 2018) commonly improved the quality of life and well-being of female-to-male transgender individuals."
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6603217/

"Overall, non-binary youth (13%) were significantly less likely than binary youth (52%) to access hormone therapy, but they were more likely than binary youth to report experiencing barriers to accessing hormone therapy when needed."
https://www.researchgate.net/publication/322364079_Non-binary_youth_Access_to_gender-affirming_primary_health_care

"49% of non-binary individuals also desired hormone therapy, although only 13% of these individuals had received it, relative to 71% of binary individuals."
https://www.researchgate.net/publication/335459665_Comparing_the_health_of_non-binary_and_binary_transgender_adults_in_a_statewide_non-probability_sample

Apparently nonbinary trans people are accepted by theoretical science, but still face difficulties with practical medicine and everyday life.

"Non-binary adolescents experienced myriad forms of invalidation within multiple social contexts, which contributed to negative affective and cognitive processes, including confusion, self-doubt, rumination, and internalized shame. For many participants, the cumulative stressors related to invalidation contributed to poor mental health outcomes. Data from this study suggest that identity invalidation is a unique form of minority stress that may especially affect non-binary individuals, with significant implications for their social and emotional well-being."
https://www.researchgate.net/publication/332994345_Invalidation_Experiences_Among_Non-Binary_Adolescents

The stereotype that nonbinary people don't transition is a kind of a self fulfilling prophecy, because it leads to their medical needs being invalidated and denied. But in general, linking one's validity as a trans person to their transition is a toxic practice, since many binary trans people can't transition either. "Trans" isn't short for "transition". The word "transsexual" initially was reserved for people with a desire to have different sexual roles and/or anatomy, that included gay people (https://www.etymonline.com/word/transsexualism), and it was coined a decade before first sex change operation was conducted. Applied strictly to gender, "trans" means identifying outside of your assigned status (that's true for both "transgender" https://www.merriam-webster.com/dictionary/transgender#other-words and "transsexual" https://www.merriam-webster.com/dictionary/transsexual). Which can include nonbinary people too.