I agree with this point. A lot of RubyMotion fans seem to be trying to build an app for iOS while learning as little as possible. While that's great if you're on a tight deadline and want to play to your strengths, Xcode is an incredibly powerful tool and features like the static analyzer, visual debugger and core data visualizer shouldn't be thrown out because some command line utility will let you Build & Run.
It's not a question of learning something new. It's that there's a fundamental, philosophical split between people who hate IDEs and people who love them.
It's one of those long-running holy wars of programming that goes back way further than iOS development.
