In practice, it would seem sensible to assume that at least some of the movement is structural, or at least will last long enough to either damage price expectations, or affect economic activity (too much expansion, in the case of a depreciation). So I am not sure that the Ball rule has advanced us much past the intuition.
3  4  The damage done by short-term exchange rate movements may change over time, and be regime-dependent: “It is also important for central banks to recognise that, as is the case for most economic relationships, the passthrough from exchange rate changes to prices is likely to be regime-dependent.