The micro textured surface* of the ereader screen can be slightly coarser than on the best 300 dpi panels to better blend the coloured pixels to mono (like the anti-aliasing filters on a camera sensor, but then you still don't get 300 dpi mono).
[* Which is why most eink ereaders are less shiny/less glare than most tablets & phones, it's not because they are eink!]
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