Apart from CYOA, I think a hypertext "book" would be the most effective way to dynamically scale detail preferences without resorting to skimming or skipping.

Some people want more or less evidence based on their level of skepticism or critical thinking, while others want more evidence to reinforce the soundness of their inferred position on a topic, especially if it's a topic unfamiliar to them. Other people are under time constraints and just want the key points and a brief presentation.