I believe having readable books in the tower would add to the immersion experience that some might enjoy. I've had the experience of when playing elder scrolls with the lore scattered throughout the world, that I felt like a true adventurer trying to understand the complexities of the world.
I'm just saying it wouldn't be terribly hard to add it in the tower, where the stairs are with books shelfs. It would be cool
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Bungie expects you to read the plain text books hidden in the lore section. Adding them to the game would cost money and provide nothing. Better to spend dev dollars on streamlining ever verse. Make sure you check out this weeks offerings!