They only really started selling them around the 6, right? And I remember someone saying that really they don‘t want you to cover such a beautiful gadget because you rarely see an Apple exec using one. That in their eyes this beautiful design was never intended to be covered up.
Remember the “you’re holding it wrong” fiasco? At the Jobs press conference someone asked the executive team (most of whom were there) what case they used on their phones. They all pulled their phones out and every single one of them was naked. Now, it’s plausible that they planned that, but this was in the era you’re referencing when Apple’s stance was “Put a case on this beautiful thing?? Are you insane??”