Simple principles of effective communication are used in the solution presentation. For example, subproblems are indented. The same process is used in many forms of communication to display subtopics of the main theme. White space in the solution presentation makes it possible for the eye and mind to follow the solution easily. White space is user-friendly.
White space is a recognized tool in effective written communication.
In verbal communication, white space is known as a pause. The solution presentations in these web pages appear to be longer and more time consuming to execute than the familiar abbreviated solutions. This is a result of the solution process being completely displayed rather than retaining part of the solution process in the problem solver's mind, where it is unavailable to the reader. The solutions indeed take more time to develop. It is much as writing an essay.