Samsung is over using the same old touch wiz

So if its samsung it probably has touchwiz on it. The Gs4 screen at first glance looks just the same as the Gs3, and so on. All the phone looks the same now. Why not change them up? I remember a time that HTC put that stupid flip clock with the weather on every phone and they all looked the same. It was lame , is samsung at risk of doing the same?

Why not change it up some?