In my opinion incidents like these are inevitable and will increase as CX continue to lower the experience level on the flight deck and also fly those lesser experienced crews to the legal limits of fatigue.
Yes, because listening to 121.5 on secondary, and changing freq between FIRs on primary, requires 1000s of hours of heavy jet time.
In most parts of the world that's part of PPL training, not sure how it's done in HK though....
CP