With the first generation of mini notebooks and their tiny screen resolution (800x480), I figured 8pt was really about the smallest font viewable on screens.
Any smaller would result in letters being smaller than pixels can display, and letters would be rendered on the screen with some pixels half lit.
8pt was really so small, you needed to peer on the screen, but you could read everything flawlessly.
9 or 10pt makes more sense as being the smallest font type for reading books.
It might not be comfortable for everyone, but 9 or 10pt sizes could help with some layout issues that are not displaying onscreen very well with eg: 24pt.
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