There's Nomi on Sense8 too. Laverne Cox has a character on another show too.Probably a side step here - but I can only think of Buck from the OA and OITNB's Sophia off the top of my head. I'm probably missing a few, but thats kind of odd that I know more trans people in person than I've seen on TV...
I think having a gender fluid alien, while maybe providing some representation to gender fluid or maybe non-binary people, is really an easy excuse to keep ignoring the issue. It would be like having some wacky alien instead of Uhura or Sulu, while pretending they stood in for African-American or Asian people. It's really insulting to people who don't get representation. It's like tossing a tic tac to a starving person and acting like it's okay. If you've seen people like yourself on TV forever then you really can't understand this.I suppose the Trek way is generally "nobody cares if people are gay, or black or trans or whatever else in the future" so they don't comment on it. Honestly it's a bit cowardly to approach things that way, I think a human trans character would be interesting. But I feel they are more likely to do something like have an alien who can change it's sex at will or something as a commentary on trans issues. And maybe it'd be done well, who knows?