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Definetly fast easy display of graphics. - I'm currently on an older Sony E-Ink and even rendering simple black and white charts takes several infuriating seconds.
A text search
Flipability. For any lengthy non-fiction piece you need to be able to skim backwards and forwards to ideas and re-read passages. Bookmarks and search help, but it's hard to bookmark what you'll need until after you realise you need it.
I suspect A4 readers are just too large to be sensibly portable. I might as well have a tablet/laptop instead. Instead a sensible text reflow on a smaller screen is better, with zoom (again, fast).
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