Hmmmm .. not precisely. In physics, a binary state occurs when something can only be one of two states. On or off.
But, human beings are a bit more complicated. As many as 1.7% of humans are born intersex, with both male and female reproductive organs. Only about a third of that number have visibly identifiable dual genitalia.
Hormonal activity that determines both primary and secondary sexual characteristics occur over a spectrum. Some people will develop profoundly in one direction or another, others not so much.
Gender identity, is quite different from sex identity. Gender is more of a social construct, apart from physical sexual characteristics. A born male, or unidentified intersex, could very well feel drawn to the feminine because of hormonal balances, by social conditioning, or both. Same applies to a born female.
A percentage of those who identify as a non-binary gender will do so because of peer pressure. Unlike in the past, where society pressured people to choose the gender identity that most matched their sexual characteristics, there is pressure (in the form of positive attention and special status) today to be a contrarian and choose a non-binary identity.
At the end of the day, we shouldn't reward or punish people for choosing a gender identity ... one that conforms to their sexual characteristics or doesn't. It really makes no difference to the public at large.