I'm convinced you can explain this 100x and people never seem to understand it. Even if you give them visual aids.
Hi Gordo,
Can you please share some usefull pdf preflighting tips which will help me to understand or to check some major print errors.
To be quite honest, IMHO, I think that if you create the documents then preflighting is a waste of time. You should be avoiding problems by not building them into the job in the first place.
Building problems into the job in the first place is a failure of the file creator and of the software design used to build the file.
There's a great deal of relevant on my blog if you care to rummage around: The Print Guide
I'm not sure that I answered your question.
best, gordo