This is exactly the problem. By differentiating people in binary gender in government legal system, it not only gives less rights to specific genders, which in partiarchal society is mostly women, but especially lgbtq people. For example, by strictly requiring men and women in marriage, gay, trans and nonbinary people have a lot of problems getting them. If only law reffered to every citizen as an ungendered “person” or “human”, it will solve many problems and make everyones life happier.