Languages features are not very important for some people. Tooling is more important: I'll take Java with Idea over Haskell with vim any day. Implementation is more important: I'll take fast multithreaded JVM over slow Python with GIL (or single-threaded node.js) any day. Portability is more important: I'll take JVM over .NET any day (.NET core might change that, just an example). I don't need esoteric language features to write useful software. Even something as basic as Go or Java 1.4 is more than enough. Sure, additional features are nice, but not necessary and sometimes even harmful.