[OriginalPenguin]

Other languages that are spoken in multiple countries might be technically standardized, like the RAE does with Spanish.

But that doesn't mean people outside of Spain follow the standard. (And depending on class and what part of Spain you live in, there's a good chance you don't follow the standard either, I'd imagine.)

[afiori]

people not following the standard does not remove value from a standard.

For centuries people wrote in Latin in Europe not because it was anyone natural language, but because of the reach it would grant[1].

[1] and because in many cases local languages were less sophisticated and inadequate to philosophy/poetry.

[zorked]

Your point [1] on the capabilities of some languages is generally discredited: https://en.wikipedia.org/wiki/Linguistic_relativity

[afiori]

If I understand the topic then linguistic relativity has nothing to do with this, consider the fictional language of cave-speak as a stripped down version of English, It is reasonable to imagine that it would be harder to discuss theology or write the principia mathematica in such a language.