Or maybe, the book works on a different concept. Maybe the data stored in the book is so massive that it takes an incantation to actually extract the data meaningfully from the book? Or, the book itself as used by Hayate today is an anachronism that, while potentially extremely powerful, isn't quite "up-to-spec" to current magic technologies, either due to the mechanics of the book that do give it it's power, or because of Hayate's sentimentality?
