I see nothing useful or charming about remaining monolingual .. if that results in being shut out of the national economy. - H. Russell Bernard

Weren't humans domesticated by the requirements of the plants and animals themselves?

Teaching people to read primers and Bibles does not produce authors; it produces readers. Printing presses and publishing houses produce authors. This rule is no different today for nonliterate languages than it was in late medieval times in Europe.

It is not necessary to argue that language diversity caused the evolutionary success of humans. We need only recognize that the knowledge generated by all those successfully adapting cultural groups over the millennia is stored in all those thousands of languages now spoken around the world.