A CD goes into a ludicrous so-called jewel case, which has no spine. Well, there is a small spine, but not one big enough to write on. Reading these spines without holding the case closed is impossible. And quickly glancing up and finding a CD on a wall of CDs is impossible. With a book, you might recall the size and color of the cover to help you in a visual search.
Big books are particularly easy to spot.
I look around my office and the place has CDs all over. Even putting them in a binder doesn't help. I end up with binders and binders and have to flip through hundreds of CDs to find the right one. I hate CDs. My CD grievance brings me to this next one.