Introducing features nobody asked for with clever bs gestures, then forcing the user to undo their effect using obscure keyboard sequences or settings one has to lookup on the web is absolutely terrible UI, and something that would've never passed under Jobs' reign. It's not just the iPad windows misfeature, Mac OS' full screen mode has that problem as well. Whoever is responsible for that should seriously consider their career choices. There are PLENTY ergonomic problems to take care of, such as the error-prone keyboard entry on iOS, the Finder not showing full paths in Info details, broken window focus management (clicking a window tops ALL windows of the app), Spotlight, Expose refactored into uselessness (is it even there still?), the list goes on.

You can turn that off, by the way. Settings -> Multitasking and Gestures -> select Full Screen Apps. Just turns all that off. I honestly don't mind it on my Air but on the Mini is just fucking useless as a feature so I know this lol