Because commuters who rely on ever-needed jump seats from these countries will no longer be allowed to occupy them, due to not being operating crew.
This will be quite a blow for a good number of commuters; though, in fairness, this isn't the fault of CX - but rules of the regulators of these countries.
Ok, now I am really confused.
The rules of jump seats are quite clear regarding FAA rules. If the flight is full, you sit in the jumpseat. In our case, we are authorised to sit in the crew rest area (pending you are qualified). MH didn't mention that we cannot still use this seat - that's why I ask, how is this a factor?