I read most, if not all of my books on my Kindle. I keep all of them organized in collections so that I can go to a single place to see all related books. This feature seemed to make so much sense if paired with the “Semantic view” feature in Windows Store apps (it is a way to see high level information at a glance).
Also, the pinned tiles are pretty drab currently. This left plenty of space to spice things up with cover photos and even the progress through a book on the tile.