It is really fun to learn new languages and you certainly should know a language in each of the major paradigms. But beyond that I think learning languages migh

It is really fun to learn new languages and you certainly should know a language in each of the major paradigms. But beyond that I think learning languages might have diminishing returns compared to tackling other "axes" of difference, e.g. learning new platforms, frameworks or environments. The conceptual differences between a desktop GUI app, a command line app or a web app are much bigger than between say functionally similar web apps implemented in three different programming languages. A business app based on a relational database is fundamentally different from say a game, even if the language is the same.