Like workers in other industries, those on assembly lines can never afford to take the wrong things for granted. Assuming that automation will always be reliable or that just-good-enough products will keep customers coming back definitely shows a lack of foresight.
Another thing that assembly line workers should not take lightly is part labeling. Improperly applied labels make it harder for fellow workers to clearly see important information from any angle. Such labels also make it more difficult to scan the label bar code, which is an essential step for full part traceability and bringing up key part information on an HMI for the worker to validate.