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.

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.

That kills a kind of a fun, but there are still others. Re-reading an old favorite for example.

There is a style of spoiler on the first page, for example see Pharaoh by Bolesław Prus where spoiler is literally the first sentence.

Most things worth reading aren't so plot focused that merely knowing a bit of information about it destroys the value.

Even if I know the destination well, I often still enjoy the trip there.