[falien]

I disagree with your interpretation. The collection of expressive elements such as icons seems copyrightable in aggregate as much as any of the individual elements. What that decision says is not copyrightable is an organization of data (including choice of words that would struggle to qualify as expressive). If they had allowed the copyright on that then things like logical taxonomies would also be copyrightable. User interfaces not built with a platform's standard interface elements are more akin to works of art and can be expressive and assuming it was copyrightable then determining if a clone was infringing would depend on if it was a true clone or if there was some transformative change.

I'm not sure what is accepted case law, but the cited case seems much narrower to me than you are implying.