There's a difference between planning out some of the broad strokes — like Thanos killing half of the universe or Tony Stark dying — and meticulously plotting out several movies worth of stories. There's a million things between these movies that don't gel together and have been walked back or handwaved or retconned, even just recently - like Thor's missing eye or taking on the role as king of Asgard being undone, or Thanos taking up the gauntlet in Age of Ultron which the writers of Infinity War ignored and flat out said they didn't know what that was.
Not that any of this is a big deal. But the movies just aren't *that* mapped out in advance. There's a ton of evidence within the movies themselves to the contrary.
And it's called Marvel Studios because it's...Marvel's film production studio lol
But that's the thing, the movies are planned out enough to allow some creativity to remain with the director and their subsection of the universe, but still retain cohesiveness between the films.
The problem as this pertains to the thread, is that Star Wars didn't do this AT ALL. Not even the bare minimum. So when I mentioned that the MCU did do it, I didn't mean the minutiae of every single film, that's impossible to do at any level. But at least the MCU knew where it's stories and character arcs were headed at all times, which is how you maintain consistency.
We literally have directors talking about changes they had to make as a direct result of not knowing the specifics of changes made to other film characters based on the reception of previous movies. Civil War wasn't written with intimate knowledge of what Ryan Coogler would do with Black Panther. Infinity War wasn't made with explicit knowledge of the fact that Thor changed genres due to a middling second film. Guardians wasn't written with the explicit knowledge of what the characters would do in Infinity War. That shit's all written on the fly. What makes it all work is that these people communicate with each other so that at the best of times, no one is contradicting each other, or rather, that any contradictions are outright ignored by the general audience who didn't get their screenwriting degree from reddit.
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Dude you're talking about building upon frameworks already presented. Yeah, of course that happens. But the fact remains that they all knew that these movies were getting made in the future and had the story arcs plotted out beforehand. All the minor details like Thor suddenly being funny don't really mean anything in a roadmap.
And honestly, plotting out anything on that level of detail is impossible, like I stated above. The most "roadmap" you can do is what the MCU has done, and it's worked successfully.