I'll give that a try, but haven't the UI people pretty well determined a long time ago that you want to read darker text on a lighter background?
People are pretty attached to things being the way they've always been. White on black could leave readers feeling better, but manufacturers would still default to black on white because that's what seems normal to people from printed books.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
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