A technique can be both basic/obvious and not a course of action that everyone would agree upon. The surprise isn't that he didn't make the choice to do it tha

A technique can be both basic/obvious and not a course of action that everyone would agree upon. The surprise isn't that he didn't make the choice to do it that way. The surprise is that the choice didn't occur to him. The feedback would be very different if he simply had made a different choice.