Thin Edge Wedge
You're kidding yourself or haven't been here long enough if you don't realise this is China now with even more devoted civil servants in the CAD.
The future will be CN / FO / SO with minimum rest down route.
It will be whittled away with "not normally" "roster disruption" new patterns, new destinations will start with it diluting current patterns and any other permutations required until it's the new norm. It's only illegal until you rewrite the words to make it legal.