The reason I bring up the Chanel bags is because Chanel also applies for patents as well. I'm not trying to bring up some crazy straw-man argument. There are

The reason I bring up the Chanel bags is because Chanel also applies for patents as well. I'm not trying to bring up some crazy straw-man argument. There are actually such things called "design" patents that differ from your examples of "utility" patents (FAT file system, GIF, etc). The reason no other $10 Chanel bags exist is due to design patents being enforced. Rounded corners and icons would actually fall into the category of "design" patents. The reason why detail copying matters is because this is how infringement is determined by an individual. If said individual is unable to distinguish between the two products, it is possible that infringement has occurred. If the product merely copied a single item/feature, it is unlikely a consumer would be confused by the two products. Apple's core motivation is for trade dress protection. They need their design patents upheld so that others cannot challenge their registration. Samsung's tablet has very similar packaging to Apple and may be confused by consumers. Packaging matters in trade dress protection (see Two Pesos v. Taco Cabana).