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A true ebook works on any size screen and reflows. Usually the user can set at least the font size. Often margins and linespace and font can be changed.
An electronically delivered book was never the same as an ebook. Word, Wordstar, Wordperfect can be used to deliver a book. PDF is the most common print preview, DJVU is similar. They are electronic and can be delivering ebooks. But page size is based on a paper size, not viewport or screen. Normally you can only zoom in/out the entire page.
A PDF is not and never was an ebook. Thus while epub3 and Kindle formats can deliver real ebooks, fixed layout (FXL) Kindle or epub3 are not "real" ebooks. Print replica are not real ebooks. They are books in electronic storage/format.
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