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Page numbers require either (a) pre-rendering the entire book at each font size to determine screen-page boundaries or (b) having some sort of content-size based "pages" which are disjoint from "screens of texts."
You can't do (a) statically if you have devices with multiple screen sizes, and doing it dynamically causes a big delay when first opening a book and/or changing font size. And (b) people seem to find confusing.
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