I understand why they organized it the way they did, but in practice, it makes it harder to use as a DM's sourcebook, since you're going to have to remember where everything has been scattered throughout the book.
But as a book of inspirational material, it's very strong, although some of the player-facing stuff needed at least one more balance pass than it got. (There's a reason your character optimization players keep asking about the cartomancer feat.)
It's a good worldbuilding book and the next time I play 5E in person, I can definitely see using the cards. I might even set up a level appropriate deck, as explained in the book, to use with Heroes of the Borderlands with my family.