Even if it was true, why would this matter? Just because you share an alphabet doesn't mean you can understand each others culture.
> It's also why we have such a terrible ability to speak english, which create way more problems than it solves.
Such as?
> Mongolia is a very peculiar culture
What's peculiar about it? It's no more peculiar than any other culture. But I'm guessing you meant it's a unique culture. But even then, it's not. It's part of the greater nomadic central asian culture.
> Language preservation is overrated.
If that was true, we'd all be speaking latin. Thank god for language preservation, otherwise, we wouldn't have shakespeare, mark twain and the world's most productive language. Think about all the art, history, culture, value that would have been lost had people like you succeeded in the past.
> Every time a language dies, like latin or summerian did, we gain uniformity.
Simply not true. The "death" of latin brought linguistic/cultural/etc diversity. When european nations started teaching in their own national languages and when they started worshipping in their national languages rather than latin, it created more diversity.
> We tend to react in a very emotional way when it's about culture, and I'm not sure it benefits our specie.
Why doesn't it benefit our species? You act like if we all used the same alphabet and spoke the same language, we'd have some kind of utopia. You act like people who speak the same language don't have wars with each other, don't brutalize each other and have cultural differences.
It seems like you've bought into the globalist monoculture nonsense. Where we all think alike, talk alike, eat in the same fast food joints and live alike in cities that all look alike. For our species sakes, I hope not.