If you read the first link you gave you'll find several instances explaining that while dialects from nearby locales are understandable, ones from further away

If you read the first link you gave you'll find several instances explaining that while dialects from nearby locales are understandable, ones from further away eventually become unintelligible. Nation states emerged after the improvement of transport first with rebuilding of road systems and then with further developments in technology that made it possible for more people to travel further. The development of so many dialects was a direct result of people not travelling anymore causing those populations to become isolated and diverge linguistically. The re-emergency of reliable travel necessitates standardization of language since you can't be expected to learn every dialect within an area governed by a single body. Using Romance languages goes completely against your point since they are all offshoots of the OG standardized language.