"I carried a Kindle on the CDT this summer ..."
Hey Ryley, nice to see you here! (this is Gadget ...) Trying to ease some residual foot pain, so I've been sedentary and rapidly growing fat after I finished last month.
You must have broken your first Kindle quite early on! The rangers made us carry cans too in GNP, but as we had cached some food we were able to get by with the little weekender models, then as I presume you did, ditched those at East Glacier before going into the Bob.
On the actual topic here, I agree. Yogi does both her books in a two-book set, one to look at from home, one to cut up and put in resupply boxes. The total paper weight and volume of the latter is pretty small. I'd just not worry about trying to economize here and take her stuff along in paper form. On the CDT I was carrying Ley maps, Yogi guide pages, Wolf guide pages, DeLorme atlas guide pages, and for the latter part I even carried CDTA map book pages. The total weight from the Yogi pages was quite insignificant in that context.
It's not as bad on the PCT, but if you're carrying WP guide pages and/or paper maps, again, the Yogi pages won't be that big a deal. Plus you'll definitely want the water guide from the start. I did carry that in digital format (and got updates via cell-internet along the way), but I also found it worth carrying that in paper form --- the water guide was THE important bit of paper to carry for the first 700 miles or so.