Especially for non-fiction, ebooks are lacking the "flippability" (for lack of a better term) that print books have. The slow response time of e-ink, IMHO is a big factor in that. I was trying to read David Graeber's Debt: The First 5000 Years on my Kindle, and I eventually caved in and got the print book because the Kindle version frustrated me when I tried to flip back to review earlier points in the books.

I would posit that this is why e-books are still far behind print when it comes to textbooks. Even Millenials prefer print textbooks, even as they adopt e-books for other purposes.