Pointless argument IMO. The word "need" mean different things to different people. This also affect what player people should buy. If someone -need- a player that look good, and deem the Apple product good looking, then yes, they will both -need- an iPod and a protective cover. If someone only -need- the features of an iPod with no -need- to sell it off to someone with the previous description/a player that is scratch proof, then they can just buy the player without a protective case. Likewise, if someone -need- a player with features not found in the iPod, they should look elsewhere. It's all about individual needs.
It's like microphones (among of other things). Not all of them are designed to be indestructable like the Shure SM58, and some of them are known to be quite fragile. But for some people, the later is still more suitable for their specific needs. Yes, it would be great if the Apple product is more scratch resistant, but I wouldn't call it a fundamental -need- for everyone if, and assuming that it does not affect the product's functionality.