I do think it's likely that there are some people who are legitimately non-binary; i.e. they feel genuine gender dysphoria over identifying with either gender.
But I also get the impression that a significant number of people who now identify as nonbinary don't actually experience any dysphoria in the medical sense.
Rather, they are mostly just embracing an aesthetic that has become popular within a certain Gen-Z niche. Somewhat like the kids who identified as "goths" back when I was in high school.
1. That take takes me back to high school when folks coming out were scoffed as millennials just "going through a phase" or "following a fad", not unlike wearing skinny jeans. The more things change
2. What a murderers row that is the list of recommendations. Only folks missing are OP & DaleCooper.