Because everything in engineering is a trade-off. E-ink screens can be read in daylight because they’re not backlit and rely on ambient light to reflect off of or be absorbed by the white/black parts of the screen. The problem with e-ink, if you’ve ever used a kindle, is that they’re slow to update and can’t (as far as I know) do color. Those are fine limitations for basically an electronic book where you only turn the page occasionally, but if you want to watch video or have navigation tasks be responsive you have to use a traditional LCD screen which relies on a backlight that is easily overpowered by the sun.
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