I agree, I really don't like having to bind all the methods manually, and I'm not sure I agree with the argument of causing confusion. Being used to having to bind and finding out it's being done automatically in React is just a sweet surprise. And besides, I'm sure we'll only see more and more automatic binding in future projects?

Lambda expressions which capture "this" have replaced almost all the cases when I'd use .bind in the past, the only time I've needed to do something like that recently has been when attaching events to the window object which need to be detached later - and come to think of it, writing a wrapper around that which just returns an object with a .detach() method would remove that use-case too.

Something like,

    this.handler = new Handler(window, "mouseup", () => this.whatever());
    
    // later...
    this.handler.detach();

YMMV though.