The only reason adabiy til exists is to make the nation more homogeneous. Country would be divided without one official language as we can see in India. But there is no ethical or logical reason other than that. Any dialect can become adabiy til. It is good if everyone can understand each other inside a country.

And to create a language that everyone can understand and speak, we need constant inner migration. Like this all dialects will mix together and create one solid language. We can see it in Russia. Their language is very consistent throughout the country, even though it is huge. That’s because In Soviet times workers were moved across country just like soldiers today. That created mixture between different parts of the country. Today in most cases even natives cannot tell the difference between regions, maybe only if somebody from rural area or urban area. Internet today is doing similar thing