ipads are designed primarily for consumption not creation. I'm sure lots of people manage create something on an ipad anyway but that doesn't mean it's a good tool for the job. Filming a movie on an iphone is just using the camera. I'd be very surprised if anybody making a full length movie with their iphone edited that film on their phone or an ipad.
>>autoex+(OP)
> Filming a movie on an iphone is just using the camera.
Not really. And this is why native apps are necessary. You can't use the built-in camera on an iphone successfully in this way, and I don't know any director who has. They use specialized third-party apps which give them the appropriate control.