@cassolotl I'm late to this but UGH, I wish I were surprised that binary people like me were 50% more likely than CIS people to say dysphoria = trans.
My only insight is that maybe staying in the binary brings extra pressure, social and internalized, to be "sure." Dysphoria lets us say, "Yes, I had to."
The thing is, my experience kind of lines up with this. When I have long, non-dysphoric stretches, I start to worry "maybe I'm not trans" (which is ~ridiculous~). That always leads to emotional collapse. It's gotten so I plan time off work when I feel it coming.
No real point, but these results are turning up my enby envy.