It's just stylistic. Glenn started it with his original filesystem branch, and I think I prefer it. It seems slightly easier to not screw up than using `self` variables. Personally, when I use self variables I end up with bugs in which I use `self` 9 out of 10 times and `this` the other time. Binding whole functions seems to make modifying already-written and delicate code a little easier because I don't have to keep track of whether I should be using `this` or `self`. Bugs will be more quickly apparent with function binding because every reference in the function will either be wrong or right instead of just one of them being wrong. I'd be in favor of incorporating this into the Brackets style guide...