Without a doubt, cultural and linguistic diversity is valuable and exciting. However, the huge number of languages in existence can also become a problem. When people with different mother tongues try to communicate, their efforts can quickly become stifled.
You have probably been in a similar situation when on holidays: You want to convey something, but lack both the vocabulary and syntax to do so. When travelling, you can often use gestures to establish rudimentary communication and basic English also takes you a certain distance. Such amateurish interpretation situations usually stay with you as funny episodes and are an important part of intercultural contact.
Furthermore, you might also be familiar with the other side of the coin: Most likely, you have been in situations in your home country where you wanted to help out citizens from different cultural backgrounds or tourists. In the end, we usually manage to somewhat overcome linguistic boundaries but there are also situations in which basic communication is not enough and can even lead to negative results.