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The current best color eink tech (Kaleido 3) has a handful of limitations, but the big one is how the screen is naturally darker than conventional eink devices you may be familiar with. High contrast and natural light readability are usually the best things about eink, but the darkness of Kaleido 3 screens, caused by the dual layers (one for black pixels, one for color), makes backlighting necessary in a lot more lighting situations, whereas you could probably read a conventional eink device by candlelight, just as you could with a book.
All these devices have backlights because they need them, but by turning it on you lose most of the benefits of having eink in the first place. At that point it's like using a standard tablet, except the color depth is only 4096, so imagine the worst tablet screen you've ever seen... and this just looks far worse.