It’s part of the stereotyping, I suppose. Romance is supposed to be for everyone, though.
Not all stories have to have romance. Trying to force fit will only mess up the story.
Edit: Why not more nonbinary ROs? I guess some ROs being nonbinary is both more realistic and more inclusive- hey, even in my WIP, some Maverick Hunters like Valentine are nonbinary. In fact, Hannah actually popularised this in Honor Bound.
I’m sorry I wasn’t clear enough.