I really have to point out that like any research study the context is important here. The study was not done using any stories which the subjects were invested in. That makes a huge difference in how spoilers affect the story. If I’m really invested in something (e.g. Marvel Cinematic Universe).
Additionally, the beauty of enjoying the filmmaker’s process and direction comes from watching or experiencing something A SECOND TIME! If you watch a movie that has been spoiled for you, you never get to experience it in its entirety without spoilers.
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