The off-set procedure was simply to avoid overlapping of radar blips, nothing to do with wake turbulence, separation or traffic capacity. Hong Kong is not using this procedure but they will keep the traffic off-set into Hong Kong's airspace without coordination!
Because of weather, the traffic may be miles off track, Hong Kong had already agreed to accept that, i.e., no need to resume track when clear of weather, but on many occasions, they insisted to put the traffic back on track by the airspace boundary. That ended up a sharp turn in order to intercept the waypoint. You never know their thinking.
If you fly to some destinations such as ZSHC or ZSNB, the highest level you can get is normally F266. Why? Because you will call for descent before the traffic going to ZSPD or some places further away. By leaving you at F266, the descent through problem is solved!
There are two cross-strait airways, F290 and F310 are the levels to be used on these airways. To solve the crossing traffic problem, they simply block these two levels on airway A470 "forever" without considering the real traffic situation. That ends up the traffic from VMMC and VHHH struggles to F330 everyday.
This is how they manage traffic.