IMO any good plot is basically unspoilable. Sure you might be given a major plot point but unless the quality of the show/media is hinging incredibly hard on a specific plot twist for most of its oomph, no detail reveal should make you less interested in the story. Hell spoilers can sometimes get me more interested in going deeper into something, I know that was the case for Hunter x Hunter when I was just casually watching some videos and a youtuber namedropped some surprising moments from later in the story.
I know people really value that first viewing experience, but just because I learn a character dies or some twist happens shouldn't ruin the story, you still get to view the composition of the scenes and how the artists behind everything wanted to present it to you and you get to see the drama behind the moment even if the surprise factor is gone. If losing that single surprise ruins the story then the story was flawed to begin with.