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I don't understand the problem here! Prefetch loads additional data while you're not doing anything. The whole argument is that prefetch doesn't respect caching??? Those are two different concepts. While I am looking at slide N I don't care if slide N+1 image is loaded fresh or from a cache. Am I missing something here?

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You are missing something, but I wish people hadn't down-voted you for asking an honest question.

The problem described in the blog post is that prefetch loads the resource into cache, which when combined with per-site cache segmentation means that it's ambiguous which cache a resource should be loaded into when it's prefetched across sites.

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