From a physiological standpoint, I don't think document scrolling is of any help when trying to read something. Especially when it's not the reader who does the

From a physiological standpoint, I don't think document scrolling is of any help when trying to read something. Especially when it's not the reader who does the scrolling. Scrolling is needed when you have a document that doesn't fit on the screen / inside its window. Splitting things in chunks is helpful, and can even be helpful if the unit of splitting is dictated by a physical constraint, like page size. It can sometimes be annoying when a flow is broken at an unfavourable position by a page break. But even this kind of uniform splitting provides natural orientation points for the reader to find things previously read or skimmed over. It provides an indexing method for free ("consider the figures on page 14"). It also allows printing on physical media (if wanted).