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Certainly the color (or 'prism-ing', where white light is split into its constituent spectra) issues are more obvious when there's not much ambient light, and the light level of the LEDs is low (as in most of the pictures posted here).
My conclusion is that the tolerances involved are too narrow to control perfectly. It is probably the capacitative layer between the glass (or plastic) light guide and the e-ink layer that is responsible for the prism-ing, as it is sprayed on and very thin, so even a small variation in thickness can cause 'special effects'.
Because I'm one of those people who can readily see these imperfections, I gave up on reading my Paperwhite in the dark a long time ago, and vastly prefer reading on my smartphone or tablet in those conditions (using Night theme), and tend to avoid doing much of that type of reading.
For me, it is perfectly fine once there's a minimal amount of ambient light to mix with the front light. I'm not nostalgic for the good old days when I was using clip-on lights and lighted covers.
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