For example, a true hypertext can have lots of repetition, because each time the reader passes through "familiar territory" they might be looking at it from a different perspective. But when a writer writes a book, they can't use that theme of repetition very easily.
Explicit repetition works in hypertext because the reader is automatically aware that it is one's location in the docuverse, and not the docuverse itself, that is repeating. Actual physical repetition of sentences or paragraphs within the body of a book is anathema, becuase the reader stops paying attention.
Skimming through a book destroys its authority, becuase the reader is no longer accepting the work on its own terms. But skimming is encouraged in hypertext as a way of traveling at high speed through the docuverse to reach a place of interest.
The interesting thing about these "proto-hypertexts" is that they have to use thematic repetition, or repetition of "turn to page XXX" instructions, rather than literal physical repetition of words and letters.