There was not a time in the past when switching languages was less common. The tools of the past assumed one would switch between any number of languages; each

There was not a time in the past when switching languages was less common. The tools of the past assumed one would switch between any number of languages; each tool would have its own, often maximally powerful, language. This has become less pervasive as communication and code sharing has become easier, allowing conventions and standards to unify.