It is assumed that next week we are going to have another story of how Tyrande learns to forgive or something like that ... But in addition to that Elune already supposedly took away her powers in the previous cinematic making one of the two cinematics useless.
With what excuse now that if we have Sylvanas we are not going to kill her?
It's like "Tyrande is crazy with revenge, throw the sacrifice to see sis e calm"
So now that Spoiler is different now if she can kill Sylvanas whenever she wants so she can fulfill her revenge and then rebuild. She is no longer choosing between revenge and rebuilding. She now she can take both.
(but we know that she is not going to get her revenge).