Because your app will work on all platforms and the rest of the billions of app users outside of this little niche-of-a-niche-of-a-niche forum just want to do whatever they need to get done on a app in their normal lives and don't even know what you are talking about when you say the app "sucks" because it doesn't use exactly the right rounded corners on a button or the listview scroll physics are exactly same as a "native" app.