PDFs exported from Publisher do not offer any checking for errors. As an example, if an RGB image is inserted in a CMYK document it will be embedded in the PDF as RGB even if the colour space is set to CMYK. I usually use Acrobat Pro to view PDFs produced to send to a print shop even though InDesign gives a summary of the PDF properties. Mistakes can happen, but at present they will not be picked up if relying solely upon Publisher, and if someone is using Publisher are they likely to be using Acrobat Pro or any costly alternative that provides print production features? The print shop could be relied upon to check the PDF but this hardly seems a professional approach.