A Shuri D+ would have been a great way of displaying Shuri's journey of becoming who she's was meant to be. And maybe in the 3rd movie when she becomes the king of Wakanda, we get a scene where Shuri is overwhelmed which causes her to have a private mini freak out, then T'Challa comes in to comfort her saying she can do this, she has come a long way to earn this and that he knows it's hard but with T'Challa on her side, He will always be there for her even if he's not the ruler anymore further showing the sibling relationship and the love the two have for each other.
Too bad we ain't never going to get this.