I think this concept of a text "resisting" the reader or "yielding" to the reader is quite interesting. I wonder if we think that reading a book with what is characterized here as non-trivial effort (eyes moving across page, turning page) is inherent to the medium or trained behavior. In other words, do we find reading a codex to be trivial effort and traversing a hypertext fiction non-trivial effort because one really is easier to do than the other, or because we have been trained throughout our lifetimes on how to approach print codex?
I am leaning towards the latter; I think of young children and babies who can figure out how to use iPhones before they can learn to read. I also think that as the "norm" shifts, and more and more kids grow up experience narrative and storytelling thru video games and hypertext fictions, our notions of what constitutes non-trivial and trivial will change. The singular focus and dedication needed to read a codex may likely become a struggle for a generation that grows up experiencing digital media, rather than print media, as the norm.