[adamnemecek]

> Although English is seen as the lingua franca of the 21st century, it wasn't always like that.

I'm aware of that.

> And even English is not as common as many people think, just traveling around the world will teach people that there are many places where knowing English will be of no help.

I guess it's not just about sheer numbers but also about what sort of stuff is produced in the language. E.g. the expert books are mostly written in English. You don't even have to go that far, e.g. there aren't all that many say compiler books that were not translated from English, that are up to date and not terrible. This is for me more important than being able to have a discussion with Bhutani farmer.

> Besides languages represent culture, not all concepts are expressible across all languages and they are also a door to our past as mankind, sure they are worth preserving.

Well it's a tradeoff. And I think that at some point the cost of preserving them outweighs the benefits.

[pjmlp]

> the expert books are mostly written in English.

This depends very much on the domain.