I appreciate your statement of nuance, However, most letists behave as if systemic injustice is the primary cause, and the only cause worth dealing with, regardless of whether evidence or research suggest otherwise. In fact, they are actively hostile to even attempting to find and compare other causes. And thinkers like Kendi outright say that all disparity is evidence of discrimination: https://dailycampus.com/2020/09/21/no-disparity-does-not-imp...
> Gender. The observed behavior among humans is clearly very complex, but the right keeps insisting that its binary/immutable map is the territory.
I have no problem believing a person can invent a definition of gender with complex meaning. Most conservatives, however, simply reject these formulations as a mixture of false, societally destructive, and causing far more harm than good. Before the 20th century gender was a word related to grammar only: https://en.wikipedia.org/wiki/Gender
From Wikipedia: "The concept of gender, in the modern social science sense, is a recent invention in human history.[26] The ancient world had no basis of understanding gender as it has been understood in the humanities and social sciences for the past few decades.[26] The term gender had been associated with grammar for most of history and only started to move towards it being a malleable cultural construct in the 1950s and 1960s."
It was John Money and colleagues who lead the way with popularizing gender's redefinition: https://en.wikipedia.org/wiki/Sex%E2%80%93gender_distinction,
And, as we all know, Money proved a very evil human and poor scientist, as his seminal research was entirely and thoroughly debunked.
Conservatives argue that the best definition for gender is a synonym for biological sex, which for humans has two functional categories. I have yet to see an iota of real proof that a more complex definition is truer or better.