Comment Re:Not Apple's fault (Score 1) 255
Other than looking pretty, what purpose does having a glass back serve?
I'm not a materials engineer (or any kind of engineer for that matter) but I think the issue is a little more complex than that. First of all, though laypeople like us refer to a material as "glass" or "plastic" each of these terms describes a large class of particular materials with sometimes widely divergent properties. The iPhone 4's "glass" isn't the same as the glass in your drinking glass. (I guess they call it "aluminosilicate glass" but I don't know what that means.) And who knows if the glass on the back is the same as the glass on the front.
Unless an Apple engineer shows up it's hard to guess at the exact reasons they would use one material over another, but we can guess. For one, they say this material is stronger than plastic, though obviously it may be more prone to shattering when dropped. That's an interesting trade-off; maybe using the glass improved the structural integrity overall, reducing the need for internal structural components and thus increasing the space available for the battery. Maybe Apple's testing showed that dropped phones were likely to break regardless, and the glass back didn't increase the average damage per drop much. Maybe testing found that people were naturally more careful with glass objects.
I think it's too easy for Slashdot types to have this reaction that some product design decision was completely stupid because they see some obvious downside, and the advantages are sometimes harder to see. But there are a lot of products which seem to have no obvious flaws, but completely suck because the designers never take any risks (see: Microsoft Word). I don't like to use those kinds of products.