Gender and sex are not my expertise. I can see how having gender and sex linked at the start of someones life being useful for them to get a grasp of who they are. However, gender dysphoria is a real thing and it shows that sex and gender are not linked in the long term. But, once you start bringing in gender pronouns other than he/she I no longer care about your issues. I will not call you xim, zer, zed, they or them (unless used in the appropriate context of a sentence), attack helicopter or w/e.