I don't see it as a useless feature at all. I downloaded a couple of collections that came across as ~20 short stories. Right now I have around 80 or so "books" in internal memory on my reader. Sometime I might go weeks in between reading on my reader. I often can't remember which stories I have read. So now, I have to open up the book and check (usually by "continue reading" page number) to see if I have read it or not. If I could delete, then I wouldn't have this problem.
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