Every plate should have a QC scale (1x1 pixel) on it and both prepress and press should be trained on how to interpret it (which curve applied).
YES, prepress and press have traditionally fought like cats & dogs.
I think it's because of lack of management improvement process into solving problems quickly. When their is a problem, is it prepress or press? The scale on the plate AND color bars on the press sheet (what is TVI at fingerprint/profile SID) will provide the data to resolve.