Arrow functions are immensly useful, and the lack of some of this syntax for a language which naturally lends itself to a functional approach was so jarring tha

Arrow functions are immensly useful, and the lack of some of this syntax for a language which naturally lends itself to a functional approach was so jarring that coffee-script grew to immense popularity because of it. Like any sufficiently popular language, literally any choice will be met with a vocal group of people who dislike every single aspect of it. ES6 was a long time coming, and has made Javascript much more legible to read as well as making it easier to write.