I think it's not asking too much if one is asking for features that make use of the digital nature of the ebooks as there are for instance a good search function (in the book itself, in the library), an annotation function that is worth its name (scribble or underline or mark something in the file and copy whole sentences/paragraphs for citation/for use on other devices), an appearance according to one's preferences (fonts, font-size, line-height, margins), a good library management (be it with tags or folders or...), dictionary support...
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