Plain and simple: we don't have the engineering resources at this time for developing the kind of product our users expect from us. There are other concerns like how iOS does not allow direct access to files on a camera card that would make the experience fairly painful. There are products out there for iOS that try to be "Photo Mechanic for iOS" out there that you may be interested in. Check them out.
For now we are focusing on desktop applications. This may change in the future.
-Kirk
