I don't think I'm missing the point: I think the notation is just fine -certainly nicer than regular expressions. You're just not used to it. Lots of people use K.
You did mention that you did not bother to learn APL. That's the reason you don't get it. I am trying to use mathematical and musical notation to illustrate the value of notation. It is obvious I am not doing a good job.
Let's just disagree and move on.