Take, for the sake of argument, that all this reading, this scripted responses, this backstory was created after the films launch, none of it was available before launch. It simply means they explained away the awfulness after by using whatever helpful fanfiction they could to piecemeal fix the terrible crafting.
It is a truly awful film.
It will always be a truly awful film.
Some minor changes and various scripting changes could have dramatically improved it. The film made piles of money, and helped continue to ruin a franchise.
No, original scripts, deleted scenes etc were not created after release nor is it fan fiction. Script was mess around with to much, then messed around by a director who didn't care about the story.
There is no reason the 2nd move can't be great, it just need a a coherent script, no mystery from what's his face who should never have got any work after Lost anyway.