Personal preferences and others would be equally upset if you changed it to the other way now. Some people like to know there is only 3 pages left in a chapter so they will finish it before they stop reading vs 10 left so they might as well just stop now.
I think (and I might be wrong) that part of the answer is the way a kepub is put together. IIRC each chapter in a kepub is a separate file. In order to figure out pages/book it would have to go through each of these every time you opened the book or changed font or font size which would slow things down. Most epubs are one file so this is a more straight forward thing. Not sure the whole rationale behind the kepub structure but it likely has to do with the processing involved to make sync between devices work (a lot easier if you are looking for word 234 in a given chapter than finding word 3245 in a whole book).
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