The reason I asked specifically about Grey Worm and Missandei is because they're already significant, she's right next to Dany all the time and he's running her army, plus they have their own relationship.
Would giving them more screen time be a good idea?
My own answer is; if it serves the story, but that's because plot matters to me. So should we see more of Missandei dealing with Dany's problems as queen? Should we have more of Grey Worm tackling security and strategy for her? It's not like the show doesn't run on court intrigue a lot of the time.
I'm playing devil's advocate a bit because i like show enough the way it is, but we are watching an adapted story which has taken a lot of liberties with the novels. More change was possible, if those paths had been chosen.