I disagree. If it doesn’t work narratively then it doesn’t work. Your job as a writer is to tell the story the best way you can - you’re not a mouthpiece for a political movement and as soon as you become that then the stories don’t work.
I don’t care one way or the other if the character of Rose is trans. I care it worked within the story, it didnt (in my opinion) and it felt shmaltzy and laboured as a result. RTD has great writing chops, as demonstrated in Its A Sin - but he’s beginning to be buoyed up by a little echo chamber of yes-folks, who don’t mind if the story doesn’t quite work because the representation is there.
Many people (bluntly) don’t care that much about the representation being there and will turn off if they feel the narrative is turning into proselytising, propaganda or moral grandstanding. RTD’s big comeback hasn’t been great thus far.