I find the digital generation's fetish for physical objects kind of weird... and yes they have told me why they prefer them
I have a rather sophisticated audio system. Most times I'm lazy and play Pandora stations, but the first time I pulled out a vinyl disk, placed it on the platter and gently lowered the tonearm, my teenage boys were flabbergasted that all that sound came from that tiny union of needle and groove.
I work in a small town where they have a steam locomotive train that runs tourists through the countryside. The engine is not the most massive I've ever seen, but as I watched it chug along the other day, it dawned on me that we probably couldn't build anything like that today. Sure, we can make a nice computer model of one, but....
What we have done in the physical world will alway trump the digital for me.
As far as the book, I read the first chapter and it was intriguing. The message was to find the sweet spot in every single aspect of coffee, from ripening cherries to the water we brew with. It's a nice principle, but it would be even nicer if he gave instructions how to actually achieve that perfect balance.
I remember a cartoon from Mad Magazine many years ago. A little boy had received a model kit to build the USS Constitution. The box had a beautiful picture of the exquisitely detailed ship you could build with the wonders inside this box with bold letter claiming "Complete Instructions Inside". When he opened the box there was one large block of wood, a carving knife and a single sheet of paper that said "Carve out block of wood to look like this:", with a picture the completed model below.
I've found a lot of coffee instruction to be very similar. Roast it till it tastes good, grind it till it tastes good, brew it till it tastes good. There is precious little information on just how to achieve it.