Difference between FRECallObjectMethod and FREDispatchStatusEventAsync

The guide recommends to use FREDispatchStatusEventAsync to get an async result to ActionScript. In my case my event is triggered on the native side, so looks like FRECallObjectMethod it's what I need. I just wonder why you would need FREDispatchStatusEventAsync if you can call asynchronously any method in ActionScript from Native? What am I missing?

Thanks!