[stouset]

Sure, why have two words to describe two separate but related concepts when we could just decide to pretend that one of those concepts doesn’t even exist?

“Someone’s physical reproductive bits” and “someone’s own internal perception of their sexual identity” are two separate concepts even if you believe they ought to be in sync with one another. And then when you acknowledge that there do exist people who seem quite certain that those values differ for themselves—even if you think they oughtn’t—isn’t it nice to have a word that allows us to describe this exact scenario?

Also, I’d encourage you to ask more or less any biologist whether or not they think we’re just about done wrapping up their field of expertise.