It was just an example. My point is that it's easy to make a 3D object in a program, much less to design something that in real life will be durable, easy to mass-produce, practical, thin, lightweight etc.
The iPhone 6 looks to be very durable, yet very thin. I don't think there are an infinite number of ways to make a 6.1mm thin phone that is durable and have good cell/wifi/bt reception without having those fragile glass inlays on the back.
Edit: BTW I put my 4S in my back pocket (yeah I'm one of these) and sit on it without any problem, it's almost 3 years old now. But it's kind of heavy (and would be worse at 4.7"), and the back could break if I drop it the wrong way. I don't mind the glass back myself, but it's now used as the symbol of Apple's supposed planned obsolescence by people who don't know much about radio reception. I can see how Apple would want to get away from those glass parts.