[mercer]

The syntax of the arrow function does a great job of making this explicit too. On top of that it offers 1) brevity/ease of use, and 2) standardization.

From my experience at least, binding to the outer/creating scope is something I do very often, and as far as I know my use of JS is pretty idiomatic.

Concerning 1, being able to use terser, clearer syntax for something I do so often is a huge win, and in regards to 2, it's nice to see an arrow function and to immediately know what this means, and hella better than having to search for a .bind(), var self = this, var that = this, Car.method(), etc, all equally valid as an approach, and depending entirely on the whims of the programmer behind this code.