Along with the identity and its benefits we get juridical structures - cultural mechanisms for determining who is included in a category and how they are permitted to behave. We can see this in the current state of the Gay Liberation Movement. As their cause is advancing, they move to the center, often forcibly excluding constituents like the drag queens who started it all at Stonewall. It was more fun in the radical beginnings. For example, a gay group may claim they are about sexual orientation, not gender, which glosses over the fact that partner selection is a gendered act.
Identities produce winners and losers.
Gender and Our Bodies Gender is special. Unlike other categories, gender goes to the core of our being. But consider non-op Holly Boswell. Genital ambiguity causes discomfort and is a major cause of loneliness. SRS technology favors appearance over sensation.