All of this seems to assume that knowing things about the plot will reduce all enjoyment of the story; my experience is closer to something like “consuming a work for the first time is a different kind of experience from re-consuming something that I already know”. Spoilers can damage the first-time enjoyment, while not affecting the later occasions.
That said, it does also feel to me that I don’t reconsume works very much personally, and this feels at least partially because consuming them a second time does feel much less interesting than the first time. Some people clearly like re-consuming works more often, so it may be that some people prefer the first-time experience more than others.
I feel similarly to Kaj.
I don’t like spoilers personally. Which doesn’t mean it’s the same for others of course.
I acknowledge that satisfying this preference comes at the cost of having to constantly signal spoilers.