Well, I love nightmode on E Ink devices; it works very well on my Kobo Clara HD and Kobo Aura. And, "since they now become retina-searing white flashes" would only be true if one had brightness set to a high level while using night mode ... but of course most people don't do that. I don't even notice the screen refresh much on my Kobo Aura, and even less on my Clara HD (with the comfort light set all the way to the orange side), and on both units I have night-mode screen refresh set to every page.
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