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Comparing one display for n books / pdfs versus n books isn't the only comparison that should be made. A book is both content and display. When I wrote code or did code analysis or troubleshooting, I used up to four displays, and that was back when they were CRTs. I would have used more screens if they had allowed it, the same way I would have more than 4 binders open when I needed to.
If I was a "knowledge worker" today, I might well have a dozen 12" screen tablets stacked in a milk crate to deploy as needed.
If you're working with several or many sources of reference material, of dozens or hundreds of pages each, I won't argue against paper (like a set of binders) still being about as efficient as anything, as long as it is supplemented with electronic access so searches and other tools can be brought to bear.
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