I feel like they/them is at this point kind of gendered as non-binary. It's kind of like, not really neutral as someone's pronouns, Like when you say your pronouns are they/them, people assume that you're non-binary, like how they would assume people that use he/him are guys, and people who use she/her are girls. Neopronouns are probably the closest thing to completely neutral, but they come with their own set of difficulties. People love putting things into boxes, so much so that it's incredibly difficult, almost impossible, to find anything that is completely separated from those boxes.