[dmpk2k]

You're right that a lot of material really does require a physical book. Anything even remotely technical.

That said, I would argue that a voice actor is far more significant than page formatting when it comes to novels. A good voice actor can turn a good story great, and sometimes a poor story to... acceptable.

I've read thousands of novels over the decades, both with and without audio, so I'm reasonably confident about the above.