[yokaze]

Then you have a different understanding on what "works" means.

In many languages, standardisation means that the language actually survives because without it loses its utility and will replaced by a dominant language.

Not an expert in that matter, I only try to replicate what I've heard.

Basque did standardise quite late. To my understanding, people had difficulty to understand one another when they came from another valley. That limited the utility and Castilian (aka Spanish) was often used which put pressure on the language. And what words do you learn then at school? And what do teachers learn? And what is used at the university? And all the media, in which form will it be?

Romansh didn't standardise (or better said the standardisation didn't took hold) and faces that difficulty.

I bet you'll find a similar story in Irish Gaelic.

[dmitriid]

Yes, for smaller languages standardisation kinda sorta works. And yet you'll undoubtedly find that in reality the actual Basque and Irish Gaelic that are used differ from the prescribed standard.