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.