That's the point of my question, really. And I am speaking from the perspective of someone who is considering puchasing an iPhone 5. If I know it is going to scuff within a couple of weeks of purchase then I have to take that into consideration when deciding whether or not to buy it. If I do decide to purchase it and it comes scuffed, then getting a replacement is only going to delay the inevitable.
With this in mind, if Apple's attempts to improve quality control are limited to trying to ensure that a product which will quickly scuff, does not actually come scuffed out of the box, then that means very little to me.
So my question is, is this liability to scuff an inherant flaw?
And just to be clear, I feel for everyone who bought the iPhone without knowing about this problem. I think they can rightly feel very let down.