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It seems pretty straight-forward to me -- if you want the e-book to simulate a book then the e-book has pages that you turn and you have page numbers that correspond to each page.
They have chosen to implement each screen as a page so what could be more logical than to have a screen number for each screen. As a bonus, since a computer is presenting these screens, it can calculate the total number of screens in the book (give the current font size & spacing) and display that number as part of the "page number" i.e. page 100 of 300.
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