Certain books need to be physical. Flipping back and forth through a calculus book is much faster than through smartphone.
Smartphone books only work for books that are meant to be read from page 1 to end.
Smartphone books only work for books that are meant to be read from page 1 to end.
I think you're bringing up an edge case. Fiction and non-fiction books tend to be meant to be consumed front to back. A better edge case would be books with heavy endnotes, but honestly, those are handled better on my Kindle than with a physical book too.