Well, essentially your re-layout loop would probably end up applying some specific pattern in code. Declarative UI is basically a way of doing that in a way tha

Well, essentially your re-layout loop would probably end up applying some specific pattern in code. Declarative UI is basically a way of doing that in a way that other developers have a better chance of understanding, and is less prone to bugs. Not that you couldn't go the hard way and write the responsive UI with code only. A XAML file is essentially just a recipe for creating the hierarchy of objects in your UI, that the framework then goes on to draw. Everything that is done in XAML can just as well be done with code.