So your justifying the plastic back on the iP3 & 3GS? Still a plastic back that had the same look....and it leaked light. I think the back on the GS2 is awesome as well as the HTC One S &One X. Either way, im putting a case on them.
I'm not justifying anything. Like I just said, the plastic back of the 3G/S iPhone was substantially better than what Samsung is using. Plus I never had an issue with light leaking.
That's great that you are using a case. But your point from the start was that the backing of a smartphone doesn't matter because you use a case. That doesn't apply to all the people who don't use cases (or don't want to unless necessary). Bottom line is that it's ridiculous to dismiss any element of hardware regarding a smartphone.