Because the experience is not as good. It's not as fast or as smooth or as fluid as a native experience. It comes close, but there is a always a slight, yet p

Because the experience is not as good. It's not as fast or as smooth or as fluid as a native experience. It comes close, but there is a always a slight, yet perceptible lag. In addition, each platform has specific strengths - and the LCD of web-enabled means that they can't be used.