No matter how you manage things, you'll still have a screen full of information as a basic presentation unit, and that "screenfull" becomes the new page. My experience is that it's easier to read if you replace the whole page rather than trying to scroll by an arbitrary distance. I suspect this is because replacing all the text lets me move my eye to a well defined place on the screen to continue, while scrolling the text requires me to either track the text as it moves or hunt for the last thing I read if I can't. Neither tracking nor hunting is as efficient as moving my eyes to a defined position on the screen, so I find them more of a strain. Hunting for the last read text is especially bad because it can be slow enough that I lose the flow of the text and wind up having to backtrack a short distance to recover it.
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