I really don't understand this point of the article: I hated the fact that in Java any call might block. To me, this isn't some better abstraction, this is like

I really don't understand this point of the article: I hated the fact that in Java any call might block. To me, this isn't some better abstraction, this is like a language being impure by default: any function can make changes to global state. So actually I preferred seeing the color of the functions - it made the program much more understandable and "safer".