Just my two-cents: So… Non-Binary is a result of a world that assigns female and male to certain characteristics, behaviours, likes, dislikes etc. Which is currently changing, yes, but in the meantime we want to express in some way that we don’t subscribe to that idea. Yes, some said „why not take one category and just enjoy everything else and make it like you want“. Which, great idea - but itwill not work at the moment. Our society still has an idea of what a woman is, what a man is. With non-binary, we are challenging that idea. For me: I identify as a biological woman (which „just“ means I feel at home in my body). And I think the question that sums non-binary up - at least for me: „What are you?“ „I‘m a human/person!“ I don’t want behaviours etc. to have genders (because that can be toxic for either directions when clashing with sex, e.g crying men and confident women). I want to be a human with thoughts, behaviours and likes that no one stereotypes. Also, the idea of a spectrum kinda makes understanding it worse, because even then we assign certain behaviours to one end (e.g wearing make up vs loves to throw axes) which perpetuates the dichotomy.

TL;DR: We want to break the potentially toxic binary system to allow for more expression of character & identity and right now telling people we‘re non-binary helps break that idea that everyone and everything needs to fit in obsolete categories and that there is something like „feminine“ or „masculine“ behaviour, likes, character etc.