There is no proven health issue. Some people find ambient lit reading (paper or eink) less tiring than LCD or OLED, Plasma or CRT.
Shiny screens are known to cause headaches due to eye refocusing on the reflections. Moving reflections are the worst. Shiny is simply cheaper than high quality non-reflective and has the illusion of looking "better" in a showroom.
Non-reflective vs Shiny is more important than eInk vs anything else.
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