I can't believe I have to argue in favor of the consumer for this one.
XV's other media (anime and film) are not just supplementary works. They're not just stories that you can watch if you want to "expand" upon the story of the game. They are actually necessary to understand the game's story. Without Kingsglaive, the opening of XV is confusing and out of place. Without Kingsglaive, the scene they include about Regis's death is jarring. Without Kingsglaive, you have no idea what happened to Luna or why she is separated from Noctis, or why she has the ring. You need to watch a film to understand all of these major plot points, which are essential to the game's story.
Without Brotherhood, you have no idea how Noctis and the gang met. Without Brotherhood, you have no idea how Iris and Noctis met or what their connection stems from. Without Brotherhood, you don't have any idea how the gang formed their individual bonds with Noctis prior to the events of the game's story.
I will always argue against a consumer having to view other medias in order to fully understand a game's story. I criticized Halo 4 for doing this, and I will criticize XV for doing it too. Just because FF is one of my favorite series doesn't mean the game gets a free pass. You should always, ALWAYS be able to understand a game's story completely from start to finish simply by playing the game.
I think you misunderstood my post. I was responding to the post as a whole, which disagreed with my statement: You should not need to watch an anime series and a film to understand the game's characters or story.