You got me :) I do indeed spend as little time on film sets as possible! I fear I may have given the wrong impression: I am deeply indebted to script supervisors, they are absolutely vital (and tend to be lovely, unassuming people with minimal ego issues too, if the ones I've met are anything to go by). My point was that for editing, their input in ensuring emotional continuity is what matters above all else. Then maybe eyelines and whatnot. Hair and stuff maybe next. Straws further down the list. I agree with the sentiment expressed in your OP 100%. I just feel Vanity Fair's exploration of the role of Script is a bit simplistic. I wasn't aiming to antagonise, just to add to the debate :)
If a script supervisor does their job, you don't have to worry about any of that shit. If there's no script supervisor, we all have to worry about that shit - as a post supervisor I gotta pull out all sorts of dumb crap out of the hat in order to cover for an emotionally flat scene that underpins the whole movie (or whatever). Mass-media explanations are almost always annoying from a professional perspective. Learning to let go is the key to happiness.