That is annoying.
If a person is interested in many of the features on a Kindle but wants a SD memory card slot I will point out that the Kindle holds 3,500 books and with collections there are ways of sorting them. And that the Nook has a SD memory card slot.
If someone says they want to use the library I point them to an Epub reader based on the other features they want.
It is all about finding the right reader for the individual.