Surely it is just those conditions, and the 'relative flyability' that is being investigated and quantified by BEA and Airbus as we speak. It's certainly something that from the uncertainty evinced here, seems to require re-quantifying... especially for increasing levels of turbulence and decreasing levels of instrumentation.
Some of these pages contain discussion of the existence and capabilities of Airbus simulators extending the envelope beyond normal line-training purposes.