or genders outside man and woman, it gets real bad (in my opinion at least). Nonbinary is a fucking awful term because it's just a negation of the binary gender system
we don't have cultural associations for specific additional genders, and we may never collect enough enough people of the same kind of nonbinary to develop one. I'm not even convinced all of us agenders are sharing an interiority.
one thing we could do is balkanize the binary but the social inertia of it all would make it like how blowing up the moon would give you a pile of rubble where the moon used to be instead of giving the earth a ring.