I have a bunch of bookcases at home, thank you for your suggestion. However, I will keep using apps, since that bookcase is not really helpful when I am visiting a book store, strolling around, and adding new books to my wishlist or checking if I already own it. The bookcase also does not recommend me new books based on my reading habits, sadly.

Because different people do different things?

Some people love to catalog the collection, to add metadata to it, to know what books and/or editions they have when looking at purchasing more books, and to use it to enhance their overall collections.

Also, care to explain how we can store ebooks on a bookcase?

A bookcase would look ridiculous with just the one kindle on it

>Why do you need apps for books. Stop. Buy a bookcase.

This is a particularly idiotic take. These apps help you track your reading, they don't replace books or bookcases.