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Its 'useful' insofar as saying gender identity, gender expression, sex & sexuality are different things. But beyond that it is misleading in so many ways.1) sex is not 'assigned at birth' it is observed. 2) there is no spectrum of maleness & femaleness in terms of anatomical sex
....and 3) it states that people who are women have brains full of woman-ness and people who are men have brains full of man-ness....... which seems to be reinforcing sexist stereotypes rather than challenging them.
