Different languages have different nuances for things so there are ideas and ways of thinking that are lost when a language dies, as you may have accidentally alluded to. I grew up in Colorado and my family normalized many terms like couloir or scree that got me in a bit of temporary trouble with an English instructor in Texas who thought I'd been fishing for exotic words to use in a paper. He was a great guy and accepted my explanation that these were words I used frequently while growing up: they are my language.

I say why not have an environment for people to have the opportunity to learn multiple languages so that the inherent beauty of the variety of languages is preserved, and yet, we can communicate and silo. As a matter of fact, then multiple languages could actually come to bond us together.

Goethe said something along the lines- “He who does not know foreign languages does not know anything about his own”. As for the inherent beauty in a language, most would agree that certain thing expressed in language X 'tastes' different than in Y. As for uniting, I am neither German nor Persian, but it is my ability to use German or Persian that unites me to both the cultures (and people) in a much deeper way; of course, you can argue that the fact that I drew the boundaries of German/Persian is in itself a problem, and having had a single language would have been the ideal, but again, I doubt that since language X might be superior in terms of certain expressions over Y (until proven otherwise).

On a brief look, Esperanto seems to be mainly Western-influenced.

> I say that languages divide us and silo us.

So should we just have one programming language? Should we have just one OS? Should we have one computer game? One social media? Should we have one political party? One school? One store? One book?

> I look forward to the day when everyone on earth will be able to speak and communicate in a single language.

We already do. It's called math.

Isn’t Facebook evidence enough that “connecting everyone” isn’t necessarily a good thing?

I don't see how that argument applies to language but not culture.