I personally like the page numbers per chapter. From what I saw each chapter is contained in one file inside the kepup and it takes some time to compute the number of pages (screen turns) in a chapter. You can see this by changing the font size and you'll notice it takes a while to recfresh the numbering so I assume they did it pe chapter in order to shorten the time it takes to compute the number of pages. In order to know where you are inside the book you have the percentage although this may not be enough for some people. I think it's just a matter of preference.
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