In the alter Heim jews spoke all sorts of languages, the common thread they had was Yiddish, in fact there is a Psak from The Chasam Sofer that says a Derasha should only be given in Yiddish, which makes lots of sense consider how many languages were likely spoken in Pressburg (Modern Day Bratislava). Its like jews there spoke German, Slovak, Polish, Hungarian, Ukranian and Yiddish. Yiddish was the common Language
Today that is not the case, instead of being a united among jews Yiddish has become a divider as English and Hebrew and the main languages spoke. There are benefits to learning a second language and there are good reasons why Yiddish could be that second language, My objection is not that yiddish is spoke, more that it is forced over English or Hebrew (Or whatever the local language is) Too many people in Brooklyn can speak Yiddish but not english and that is a problem