Some places with a lot of languages have one “main” language most people can speak, like Tagalog in the Phillippines or Mandarin in China. even if people speak something else in daily life, the “main” language serves as a bridge.
But in Europe, even a short distance in any direction will send you to a place where people speak a totally different language, Say you’re in Denmark—none of the three adjoining nations speak Danish. And even if you learn Swedish, Norwegian, or German, Swedish and Norwegian are still good for only one country each except German which will get you a few more.
So realistically, how inconvenient is this?