E-books are books. They are not like books. They are not almost books. They are books. The digital format is their container, just as paperback and hardcover formats are containers. Some books are born digital, some are published in multiple formats and include digital options. They are still books, whether reference books, textbooks, fiction, or picture books. It’s just a publishing format. Authors do not like it if you say their e-books are not
“Real” books and librarians whose libraries have e-content licensing agreements to offer ebooks don’t like it either.
Format preference is a personal matter. I prefer to read certain materials digitally, but will buy a hard copy of others. Whether you prefer to read on a laptop, tablet, e-reader, or hold a hard copy is irrelevant. This is a matter of preference and content availability (and cost). Doesn’t mean that the book on your laptop is any less real than the one in your hand.
End library rant.
marginalia and such 
Yes.