Smartphones and tablets are both LCD devices which are harder to read outdoors and harder on a lot of peoples' eyes for long term (several hours) reading. Smartphones are also too small for me to read on easily (old eyes) and the monthly cost is more than I want to spend (I still use a land-line). All tablets are heavier than are comfortable for me to carry around and the battery life is too short for me.
There are a lot of reasons some prefer eink for reading.
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