(Disclaimer: I'm not a native english speaker) Responsive design, at least when it comes to web applications, is just lazy. Sure, your layout will totally shri

(Disclaimer: I'm not a native english speaker) Responsive design, at least when it comes to web applications, is just lazy. Sure, your layout will totally shrink, but that does not make it "mobile ready". The set of UI conventions that work and have worked for a long time on desktop won't work on tiny touch-enabled screens. And if you really care for the user experience of those 2 billion mobile users, you'll have to rethink and redesign every widget and every interaction for fat,lazy and impatient fingers. So I have to disagree with the notion that supporting a wide rage of devices requires an extremely low additional effort. That's simply not the case if you care about user experience both on mobile and desktop. I'm guessing that, while on a hackaton, you'll have to choose.