Well, we are the ones who decide if it looks outdated or not. It's like this. Are you using Windows 95, or Windows 7? (not really sure if your a Mac person lol). Same thing applies to mobile OSes.
You also have to think about those who aren't geeky/nerdy/"smart" enough to change their home screen (ie mod it, theme it, skin it, etc) and thus want a good looking stock home screen and OS. As for the few of us who understand how to change it and even design it (ie icons - shape, style, color, etc) we don't really care about the stock interface since we can change it, but there are times where you just don't feel like changing it and revert back to the stock interface.