Spinash,
That's OK .. some people like to stir things up to see what reactions result.
The question of what significance is represented by missing VGs is a matter for the MMEL - only the manufacturer has the full story. Problems arise when airline personnel make invalid assumptions on these and other MEL issues and inadvertently expose the operation to unplanned risk. I made reference earlier to a missing nacelle VG - the aircraft concerned flew around your patch for some days before it was caught up with and the situation corrected. Caused the airworthiness chaps quite some considerable concern.
'Twas Zeke's comment. However, events sometimes do get out of hand if test and development programs are not fairly rigorous in their safety management and planning. I recall one flight test which rapidly ended in disaster (multiple fatalities and very serious injuries) following an ill considered mod intended to be a workaround for a particular problem. Probably a more conservative TP might have opted for a different recovery and possibly got away with it - guess we will never know.
Also it is prudent to treat some informative details in manufacturers' documents with a grain of salt on occasion. Often, a design deficiency workaround will be presented as a marketing advantage - true ...