Again you are mixing up plot with storytelling. You are offering plot reasons - why a thing might logically happen within the fictional world that the movie depicts - for a storytelling question - why the author/screenwriters chose to write it that way.
Regardless of what logical internal reasons are presented - and these are coherent tales which don't raise the "why did this character do that thing?" question very often - to have a story in which your principal characters barely connect (#2) or the one who ought to be the center of the action muted and helpless for the entire movie (#3) is bad storytelling. Either make the story work differently, or write it from a different angle so that it isn't a problem. What if it were a legal procedural story told from Annika's point of view, for instance?
As for Lisbeth not being the principal character, don't be silly. Look at the titles. The Girl With. The Girl Who. The Girl Who. Who is that, if not Lisbeth? Even to the extent that it's Mikael's story, it's his story of his connection with Lisbeth. Don't isolate her and kick her offstage. That's bad storytelling.
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Regardless of what logical internal reasons are presented - and these are coherent tales which don't raise the "why did this character do that thing?" question very often - to have a story in which your principal characters barely connect (#2) or the one who ought to be the center of the action muted and helpless for the entire movie (#3) is bad storytelling. Either make the story work differently, or write it from a different angle so that it isn't a problem. What if it were a legal procedural story told from Annika's point of view, for instance?
As for Lisbeth not being the principal character, don't be silly. Look at the titles. The Girl With. The Girl Who. The Girl Who. Who is that, if not Lisbeth? Even to the extent that it's Mikael's story, it's his story of his connection with Lisbeth. Don't isolate her and kick her offstage. That's bad storytelling.