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Well this might be why there's no white case. They actually do yellow with current materials Apple uses. I had not noticed this until I compared my old 11 cases to a new one that arrived today. So they do yellow. But whats interesting is my 6 year old 6s case hardly yellows so maybe it cost too much to use the materials from preventing it from yellowing.

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That's quite a change. I have a new one still in the box (in case I need it later.) Might just pull that out of the box to try it. Though, the 2-year-old white almost looks like just another version of their white color. :)
 
The smart battery case on my 11Pro & silicone on the 11 also yellowed for what it’s worth
 
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