>>212819377 (OP)A language is only useful if its speakers are monolingual.
>Americans are monolingual -> English is useful>Latinos are monolingual -> Spanish is useful>Brazilians are monolingual -> Portuguese is useful>Russians are monolingual -> Russian is useful>Chinese people are monolingual -> Chinese is useful>Japanese people are monolingual -> Japanese is usefulLanguages whose speakers are bilingual are useless.
>Germans are bilingua -> German is useless>Swedes are bilingual -> Swedish is useless>Finns are bilingual -> Finnish is useless>French people are bilingual -> French is useless>Koreans are bilingual -> Korean is useless>Indians are bilingual -> Hindi is uselessThe more monolingual speakers a language has, the more useful it is.