For me having (or not having) page numbers is not the issue or even important....but knowing how far through the book I am does have an influence on me while reading.
This is not something that is easy to quantify with a "spreadsheet with the values and formulas". Rather I find that there is an emotional reaction to the flow of the story. This is primarily evident when approaching the end of the book where there is an expectation that the author will (or needs to) begin wrapping up various loose ends of the plot. There is a build-up in anticipation that adds to the reading experience.
YMMV, but it does exist for some of us.
As long as I can tell how far into/through the book I am, I don't really care how the information is presented.....page numbers, percentage, slider, etc.
-Jeff
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