This is true for every language in the world with any relevance. You said nothing here.
> Let's get serious: if everyone used their Spanish dialect in a hard way, the 80% of the Hispanic world wouldn't understand half of what were they saying.
I was not making that point. The point was that it was a more-or-less dead language except in a few areas. I am not saying recovering it is a bad idea either. But since that was the situation, then it needed to be reconstructed by taking many borrowings, whether you like it or not.
This is not the case for spanish or english or chinese, with all their dialects, that are spoken by a big amount of people. Of course, languages keep evolving and what is true today maybe will not tomorrow. But that is another story.
So what. RAE did the same, back in they day they were against anglicisms, italianisms and galicisms. They had to step back against cocktail, carnet, chófer, sonata, acuarela and lots of borrowed words.
I can read Leizarraga's writtings from the 16-17th century by just using the Batua.
Batua it's just Basque built around Gipuzkoan-Navarrese-Labourtan.
Kinda like yours from Valladolid-Salamanca-Madrid in Castillian. I remind you that the 90% of the world DOESN'T speak like in the former Castilles, but like Andalucia and the Canary Islands.
No one speaks "Español Unificado". No one. Pick up any Galician, Asturian, Extremadura, Andalucian, Canarian or worse, any Spanish speaker from the US to the Patagonia. No one will speak like the Castillians, ever. Even if RTVE has millions of speakers. That's it.
The same thing happens in English with the RP. Everyone in Europe learns BBC English, but no one speaks like a BBC news anchor IRL, maybe the ex-Queen.
On a global scale, the so-called Spanish from the RAE, as if it was spoken from Perez-Reverte, it's the minorized one.
Also, just cross the pond. Even those created "Español neutro" for media, yet no one uses it daily.
Let's get serious: if everyone used their Spanish dialect in a hard way, the 80% of the Hispanic world wouldn't understand half of what were they saying.
The same with Basque. Or... English:
https://yewtu.be/watch?v=pit0OkNp7s8