It's not that amazon wouldn't know how to do that. The API of the eink driver makes no attempt to hide how this is done. In fact, showing menus, cursor and the dictionary entry snippets make use of this, too. Amazon rather seems to have decided against the artefacts that get left when using this mode. After all, it's a matter of taste. I don't really mind the "flashing" and am quite fond of the crisp look afterwards. YMMV, of course.
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