The critical issue with prototyping apps is that you're designing for a mythical mobile platform only semi-related to the main two. As such, you end up masterin

The critical issue with prototyping apps is that you're designing for a mythical mobile platform only semi-related to the main two. As such, you end up mastering code, tricks, and techniques for a fake platform when you could've been learning practical fundamentals of UI design directly in Xcode or Android Studio... or both!