You are absolutely right.
I would sound a note of caution over issues like the one described. From the sound of it, it's not an obvious fault, but a subjective opinion that the screen contrast has degraded (I'm not suggesting that the OP isn't correct in saying that it has). If you return it to Sony, they will, I suspect, very likely say that the screen is within spec, and not take any action. If you make a warranty return and the result of their inspection is "no fault found", Sony will make a £30 charge (I speak from experience!). Although it's sometimes possible to get this charge waived, it can be a lot of hassle.
There is quite a lot of individual variation between individual eInk screens. At one point I had two PRS-600s, and one of them had distinctly higher contrast than the other. At a minimum I'd suggest that the OP provide a photograph showing a side-by-side comparison of his and his wife's PRS-350s to illustrate the contrast difference.
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