I have lived in three countries, speak three languages fluently — English, Chinese and German — and worked with people from more than 60 countries. I know that "You're quite funny" can mean several different things depending on whether it comes from an American, a Brit or a German.
Why does this matter? Most project failures are communication failures. When people have different understanding of words such as "urgent", "finished" or "take ownership", conflict can quickly arise. Being able to recognise when people are working from different assumptions is critical in helping them reach a shared understanding.
Functions have their own languages and assumptions too. I have worked with marketers, programmers, designers, operations teams, strategists and craftspeople, across large corporations, agencies and both seed-stage and bootstrapped startups. That range helps me translate between different perspectives, and avoid treating the way one team or business works as the only sensible way.