I think the point is that when starting out with a new text editor you aren't moving fast enough to use these shortcuts that often, so it's harder to internalize them. With this you just get rapid repetition, so that when it comes time to use them you have the command at the ready in your head. Of course I'm speaking from the point of view of someone just starting out using an editor. For someone that has already used any of these editors for any length of time this sit does seem kind of worthless.