You know what I miss? Dead tree user manuals that used to come with hardware and software. That's something that has gone the way of the Dodo, unlike most other books. Luckily I can still buy printed manuals from the FSF.
So it's not hard to believe that there are people who switched to e-books by default and later could realize they miss real books.
But...back in the 1980s, just about any electronic device you bought (especially if you bought it from Radio Shack), the manual would have a schematic in the back, plus a list of parts (and in the case of RS - the parts list would usually have part numbers you could pick up off-the-shelf at the store!).
I miss that.
There used to be full wiring diagrams for cars in manuals, but imagine that now where your car has 200 separate computerized systems, each with their own intricate circuits.