I am certainly not arguing for the de facto autonomy of the individual work, even though there is much to be said for making the attempt to see it in that light as one facet of the reception process.
One blob of red in the wrong place and the audience isn't looking at the hero, they're looking at a patch of curtain (or something similar) and your whole effect is lost.
When you've seen beyond yourself, then you may find, peace of mind is waiting there.