I disagree. If your company designs parts, tooling or manufacturing processes to meet customer requirements, there is value in mapping out your design process. Not only is your design process "beneficial", design is part of the way you create value for your customers. and by looking at the big picture QMS you strive to monitor and continuously improve your design process to be most efficient and effective. The IATF auditor may not have questioned a missing design process document because many fabrication shops only machine-to-print and exclude design from their QMS. If the outside auditor started with what you gave him, it may not have been obvious what was missing.