True on proprietary. I don's know of any impactful use cases for ObjC. However there are some good things about this. The spec can move fast, focus on success in use cases, and also make it easy to conform to 'nice' HIG. In many cases it's nice to not have to worry about these things and just focus on the end app use case. In the end when it comes to iOS and OSX its still Steve Jobs word were just playing in it.