I think it gets real ugly once you need nested data structures, the readability goes down (maps of lists of maps). Also, using overloads means it's limited to small arity, e.g. 10.
Not having first class multiline literals really makes it painful to write something like React or GraphQL in Java.
One of the things I give props to MS for is having the courage to evolve C# and TypeScript at a breakneck pace. Each release of TS, they add features I've been wishing for. They seem to be listening to developer productivity issues and responding.
I under Java's desire to preserve backwards compatibility, but they end up breaking it anyway, and make design decisions based on how they can shoehorn things into the older JVMs, but each new release ends up with some issues. Witness how long it has taken folks to migrate to Java8. If we're going to wait years for major releases, then let's make them well worth the trouble when they finally arrive.