If this were such a problem, we'd already have seen it. The iPhone 4 with its retina display came out nearly two years ago, so it's safe to assume that if there already was some kind of retina optimization, it would already have begun.
Most sites I visit don't do anything like that and look perfectly fine: Because the resolution doubled in both sides, upscaling in a good-looking way is trivial to do.
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If this were such a problem, we'd already have seen it. The iPhone 4 with its retina display came out nearly two years ago, so it's safe to assume that if there already was some kind of retina optimization, it would already have begun.
Most sites I visit don't do anything like that and look perfectly fine: Because the resolution doubled in both sides, upscaling in a good-looking way is trivial to do.