I don't think so. Reading a book or watching a show isn't about the fastest route to a conclusion. To borrow a phrase: it's the journey, not the destination.
IE: I'm watching The Crown right now. I've been "spoiled" on the outcome of the show through simple history and cultural knowledge (I'm Canadian). It doesn't make the show any less enjoyable when I know that Diana is going to die, or that Mountbatten was killed by the IRA.
There’s a different, maybe even better kind of enjoyment from surprises (or non spoiled events) in my experience. I won’t watch any movie trailer or read a review so that I go in as
uninformed as possible.
Only if the events of the plot, or unrevealed information are critical to the story. Some stories tell you what's going to happen early on. You know Oedipus is going to kill his father and marry his mother, the story is about how events conspire to fulfill the prophecy despite him trying avoid it.
J. Michael Straczinski (Babylon 5) said he likes to tell people what's going to happen, but he doesn't tell you the context. This lets him put in prophecy as a story element.
Other times the story is really about discovery. You can guess that Harry Potter will bring about Voldemort's demise in book one, but the series is about the process of Harry becoming Harry, so it's not really possible to give away any spoilers because you have to explain too much.
Well, thank you for spoiling it, now I'll need to read Electra's instead.
I always wanted to write a story about a bunch of people in a lab, playing god. In this universe there would be no rings of hell, the reader would also know there wasn't, but I think it would still grip the reader. Like an inverse hero's journey.
