[donw]

Many people chose CoffeeScript, RubyMotion, and so on, because they address very real problems in the existing toolchain.

With RubyMotion, you gain the ability to work from the command line.

Cupertino (https://github.com/nomad/cupertino) gives you a chunk of that for pure Objective C, but with RubyMotion, I can build an app and deploy it to my iPhone without having to touch Xcode.[1]

Thats a big bonus in my book. I've got a great toolchain on the command line, and don't much care to have to change nearly every aspect of my working environment because Apple wants everybody to use their all-singing, all-dancing tool.

Being able to reuse a bunch of business logic across mobile and web is also a plus.

[1] If anybody wants to share resources on doing this in pure ObjC, I'm very interested.