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Kobo + KOReader user here.
To me the most annoying part of the eink is the ghosting as described above. I value seamless page turns so most often my full page refresh is either turned off or set to a large number. Either way, full page refresh is a necessary evil that you need every once in a while.
And honestly, it’s not that bad when it’s in light mode, as others said there are forced full refreshes on wake up and sleep, etc., which is cleaning it up enough for me. but when it’s night time, and I turn on dark mode, the ghosting becomes really unpleasant. At the same time, you do not want that bright flash on your eyes in the middle of the night frequently. Thankfully KOReader has a neat setting to set the full refresh intervals for dark and light mode separately. So I usually either turn if completely off and do manual refresh or use a setting like 99 light and 30 dark.
In order to be able to turn it off, you need to tweak the book a little bit. If the book has inconsistent line spacing (meaning that the lines page after page will not lineup on top of each other for one reason or another) then ghosting will be very noticeable. At this point, you want to tweak CSS or in someway prevent the inconsistent items from messing up the line spacing. These inconsistencies can occur due to large headers, images, chapter markers. Anything that’s not abiding by the line height-based spacing is going to mess it up.
In addition, contrast and some other very valuably customization options are available in KOReader. You can definitely work around the experience managing a file system with a few UI tweaks (I do).
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