I agree that it would be difficult to define a readability quotient and I also doubt there's much motivation for one. There are differences in how good a page looks on various devices but they're very small differences. At least that's true with the newer devices.
I have what might be the least sharp, even screen on my original Kobo Aura. It was one of the first touch screen readers, maybe THE first, I don't recall. And the various coatings and layers make the screen very uneven and un-sharp. When they first came out there was a lot of comment on that fact.
I also have what might be one of the sharpest and most even screens with the best contrast, the 6" Nook Glowlight 3. When I put these side by side the difference is glaring. You can't help but notice it. And yet, reading a book on either one is just fine. The fact is that both are better reading surfaces than the used Paperbacks I used to read, often yellowed and sometimes blotchy.
When you're comparing things that are just about perfect with things that are pretty close to perfect it's just hard to care all that much.
Barry
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