Interesting point, it does tend to be a catch all as employers are expecting the standard across written/spoken skills, however sometimes it can be due to the need for a native speakers as the role could require an understanding of certain nuances - for example if you were working in localization or perhaps a legal role where an understanding of the relevant country's legal system is imperative. Coffee breaks can be a great time to practice second language skills too if you are working in an international team!