Why should print be so specifically necessary if a book's content is what defines it? That I might read, say, Umberto Eco, in digital makes it no less intellectually valuable than if I bought a paperback version, or if you want to get really fancy about things, a hard cover, if those are still even released...
If anything, being able to carry hundreds of books of all kinds around with me nearly anywhere on my Kindle, or even on my cell phone, makes it all the easier to read more voraciously. With this it requires no extra effort beyond that of having with you a device that you'd in any case carry, and thus taking advantage of many more spare moments between daily activities..
However, it's not hard to compensate for this with digital books, through bookmarking options, copy-pasting specific parts and storing them elsewhere (with tiny notes on page number and book title) and other options.
I keep all of my own digital books DRM-stripped in my own device folders and back those up too. This to at least partly replicate the possession security that physical books give. I also absolutely never trust storing large collections of them on something as absurdly untrustworthy as, for example, "Kindle on Demand", which is on-demand right until your access demand arbitrarily gets ignored no matter how much money you spent on what were supposedly owned purchases.