Defining maleness and manhood with masculinity and femaleness and womanhood with femininity reinforces compulsory gender expression (I mean seriously, to 1950s standards) and conflates sex, gender identity with gender expression, variables that are important to keep distinct from one another (especially the last two). I know men who I would consider more feminine than I will ever be and women who are more masculine than most men I know.

Gender is taken for granted by many cis people and it can be a rare moment when someone actually bothers to say "Am I masculine or feminine for my sex/gender?" Additionally, there are gender identifications that lie outside of a masculine or feminine spectrum.

There are quite a number of transgender-identified persons who are quite content with their genitalia (I guess that is what is meant by the imprecise term, "physical sex"). Many people who are satisfied with the extent to which they have altered their primary and secondary sex characteristics (I guess that is what is meant by "change sex") continue to identify as transgender. That definition makes it sound as though a transgender person is an "incomplete" transsexual person.