What they laid out were the major reveals and plot milestones. The skeleton of the story through season 4 was there from the beginning. Imagine a notebook with bullet point outlines of all four seasons. They probably do have something like that. Supposedly there's a thirty page guide to the Upside Down and another one of similar length about Hawkins Lab and the government program that gave rise to Eleven and the others.
That's not to say every plot detail (or even most of them) are set in stone. Will was always going to have that possession storyline. But the original draft had him actually killing Bob, I think in episode 3, and they rewrote Bob's fate entirely so he survived almost to the end and died a hero instead of being stabbed to death by his girlfriend's son. Most of what's going on with Steve's character is also new. Jonathan and Nancy were supposed to get together last season and Steve was going to be a jealous dick this year making things difficult with his personal vendetta. The character of Billy was added to the show to take on a role similar to that envisioned for Steve.
So how they tell the story is flexible and subject to change. But if, say, you wanted to know which main characters won't survive to the end of the series, or how many other special kids are out there, what their numbers and abilities are, etc., or even how the very last episode of season 4 will end, they could spoil those details for you right now. They could tell you all about the Mind Flayer. How old it is, where it comes from, its history, all that stuff was created at the beginning and not being constructed as they go along. This kind of pre-planning puts a retroactive consistency into the show. If you go back and watch the whole run again after season 4 is over, you'll notice little details that fit what's revealed later, which you couldn't have known were significant before. The kind of stuff you only get by planning core aspects of the story in advance.
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