[user104658]

They literally had to do something, leanings and beliefs about "gender" aside you cannot do medical research without a way to biologically distinguish male and female and have everyone trying to replicate that research understand what's meant by those parameters. Wooly language is fine for being ponderous or in everyday conversation but healthcare has to be robust and evidence-based, and for that to happen, you need clear boundaries and definitions. "It's a sliding scale" and "non-binary" just doesn't work.