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The main case that has been made for IR with e-ink has been that there is no need for another semi-transparent layer over the display so that the capacitive layers can be implemented which might yield a clearer display with less glare. Probably cheaper too, since you really don't need exquisite precision for a reader, and they probably only hear grumbling mostly from people trying to select text set too small for the IR grid. I suspect the grid not only detects position by a single emitter-detector pair being interrupted, but the driver or reader software is smart enough to realize that if multiple adjacent pairs are interrupted in one axis it must interpolate to judge the best position.
Pretty cool, if you give the screen an occasional wipe and a few puffs to clear cookie crumbs, dust, etc., it works great -despite a lip that overhangs wider than necessary around the display surface.
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