Having a standard 'page' across all of epub books means I can look at how many 'pages' there are in the book I'm reading and have a fair idea of how 'big' the book is, and thus pretty good idea of how long it would take me to read it. I know that a 200 page book is longer than a 150 page book, regardless of formatting. It's even more useful than the number of pages in a paper book, as that can vary by page size, font size, etc.
Having it be 'how many times I have to push this button' tells me nothing useful. I'm not even aware of pushing that button if I'm absorbed in a story. If I change the size of the font, the length of the book does not change.
If you want to mark a particular place in an ebook, then highlight it.
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