But their non-binary isn't actually non-binary. Its still rooted in earth human gender roles.

Its like the Holdo bitch from TLJ. Apparently her outfit was because she was from some brutally oppressive planet of conformity. So of course she dresses in pretty dresses and dyes her hair like a regular American teenager, nothing unique about it.

There are ways to do it, like the semi-interesting way the Asari worked in Mass Effect, but they never do.