In this case it is not Apple's fault at all. IOS totally has the capibility to make this work. It is Mackies fault for their poor implementation and programming.
I would agree with that, I regularly get files out of my Dropbox via the Dropbox app and send them to other apps(for example going from Dropbox to Pages). It is a PITA sometimes to work with iOS because of the restrictions imposed by the OS but as a whole it's fairly secure and reliable.
I do wish that some of the mixer manufacturers would build Android apps... But more people have iPads. I love my iPad, Macbook Pro, and Droid X.