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Well, I don't have a KOA2, or any eink Kindle for that matter, but I'll extrapolate here from my experience with the larger Kobo devices. To me it comes down to the extent to which a larger reader exists mainly as a stay-at-home reader. The KOA2, IMO, is a little large to be ideal as an out-and-about reader, so if a reader's going to be living next to my armchair anyway, I don't really care how often I have to plug it in. (This is the situation with my Aura One.)
OTOH, battery life matters for me when it comes to a device that essentially lives in a carry bag when I'd rather not have to keep topping it up and the more so if the likelihood I'd be near a charger if necessary is slim. And overall a smaller, chunkier device seems safer as a device on the move.
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