> Personally, I find most books more enjoyable on subsequent readings when I know the plot and I can be impressed with how it unravels and the author has layers the groundwork.

This is the premise behind the pro-spoiler movement, backed up by an actual study. Apparently, science has concluded that, on average, it very much is a thing. However. It is not true for every single person. I personally find it differently enjoyable. There's a joy in the discovery, and a joy in the re-treading, and they're not the same thing. I can get the latter any time I want by doing a re-read or re-watch, but being robbed of the former means I can never experience it.

It's all about giving people agency. Tag the spoilers so people can decide for themselves what they want their experience to be, you know? Don't make choices on behalf of other people based on what "science says" is best for them.