I kind of knew this in the back of my head, what with all the variorum Shakespeare editions and- lord, what was it? The Pooh Perplex? Someplace where an addled scholar compares 20th century printed texts to each other and finds only the occasional transposed line or squiggly letter in the cheap edition. And that's printed works. Worse with the fifteen mss of St Basil's On the Holy Spirit in remote monasteries on Mt Athos. I'm not at all sure I'd have remembered the information while reading- or worse, writing- a book about manuscripts.
Which said, the book does sound interesting. Libraries are in this year.
ETA: oh. Dystopian YA. Pass, then.