[stdbrouw]

It's an improvement, but not nearly as easy to use as leafing through a physical book. I'm thinking of the use-case where you're solving exercises in one place but also want to sometimes go back to the theory or to a reference section in the back.

[taeric]

This is probably as easily solved by just having multiple ereaders, honestly.

[lione]

Have an ereader for every book! It's flawless!

[taeric]

Within reason, it probably is cheaper and more workable for many people to just have two or three ebook readers than the myriad of physical books and shelving necessary for them.

Additionally, for textbook style things, it was already common to have "student handbooks" that go along with the book.