Oh I definitely get where you're coming from. That's honestly why I have an iPad. I'm going to be playing a bunch of Pathfinder at the upcoming Gamehole Con, and I'll bring printouts of my character, but also have everything, including the rules, on that. I get to play in person only once in a blue moon, so it just isn't an issue where I often need a book to reference in person. Maybe that would change if I was with a group often. Man I miss those days!
So I tremendously sympathize with people who want and need a book or books to play with their group. Until I had a kiddo, that was me. It's also why I enjoyed it back in the day when you had pocket editions of games or low-cost ones in addition. I played 3E with the Mongoose reference books! I would like to hear from people who are playing in person most of the time: do you still use a book, or is it tablet/laptop + PDF?