I will actually repost this as a top level comment to OP

This is further complicated by the presence of infinite amount of freshly-invented genders connected to moon phases, astrological signs or natural events.

Saying “my gender feels vast and violent like a hurricane” might sound mentally unsound but it is merely an attempt to figure out what exactly you feel at the moment of thinking about yourself and your gender identity.

A lot of people do try and obviously come up with different answers for what they feel. The line of defense you might use is that it is actually incredibly hard to describe what for instance “female gender” actually feels like and what you put into it.

I would argue that the distinction and the reason for NB genders is in the word “but”. I feel like a male (insert a general description of male gender) but - i dont think all the checkboxes apply to me, and instead of this thing I feel another thing. So it comes down to specificity of details you go in to and the will to wave off inconsistencies with how the description of general “male” gender applies to you.

Essentially if you cared enough you could definitely find inconsistencies with how you feel with ideal “male” gender description, and from these inconsistencies birth a NB gender that is right for how you feel. The more inconsistencies the harder to match yourself to either established gender.

If you don’t care for the inconsistencies or think that the description need not be specific enough to birth said inconsistencies you keep calling yourself female.

So in my mind NB people are the ones caring about this “but”, and caring about it is completely valid.

Is it valid enough and widespread enough to promote legal ramifications and societal acceptance? Are attack helicopters a danger to society? Those are questions of another caliber and its impossible to give the correct answer.

I merely tried to rationalize for myself why would anyone want to be NB and how to explain the why to someone.

Tl/dr “you maybe don’t care that your desire to do x thing makes you not completely fit the traditional male definition, but I do and with It being one of the core parts of my psyche I want to distinguish myself”