And some trans people don’t. Like sorry I fall into the contra camp. The only time I really understood gender beyond dysphoria and avoiding it was after two tabs of acid and several years of transition.
Cis people often do not think about gender so you find that people who are very well informed about gender can't talk with the same amount of nuance as they do with other people who are very well informed about gender. You just have to simplify the concepts so that those who don't know them yet can understand.