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Even cheap paperbacks have contrast of 50:1. Printer paper, and high quality book paper, is up to 100:1. That's why I said even the latest version is still 4x-7x worse than paper. Do some fact-checking. All other common display technologies are much higher than 100:1, btw. At e-ink's 15;1, there's no "white" and there's no "black" - only light gray and middle gray. "Paperwhite" is only aspirational, misleading marketing.
16 shades of gray IS 4-bit. With more shades, you can implement better font rendering at lower ppi counts; no reason to invoke viewing images to see a substantial improvement - text is reason enough.
E-ink doesn't do "pixels" in the way we think of them in other technologies anyway, and that's another disadvantage. The size of the capsules varies a lot; look at microscopic images of an e-ink screen. With print and other display technologies, the pixel or dot size is much more accurately controlled. E-ink "pixels" are fuzzier and more irregular.
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