Book reading apps like iBooks, Kobo, Kindle etc. allow the user to change the background, foreground (most of these apps offer white, sepia and night themes), font face, font size, and even screen brightness in-app.
News reading apps like Flipboard or Reeder allow only the text's size to be changed.
Is there a reason for this difference in features? Would a news-reading app benefit from adding features available in a book reading app or are these features unnecessary?