But if you operate into somewhere like Brize Norton, you will be given the option of using QNH. Some airlines ops manuals forbid the use of QFE - my previous employer was one and they frequently used Brize for base training.
My airline doesn't have QFE as a PIN option, so with an airfield such as Dalian, we adjust the altitude set in the ACP window to give the equivalent height. And if we are flying one of the fleet with an additional standby metric altimeter, we set that to QFE.
Kunming is combined civil/military and at 6200' elevation, the QFE values are pretty low! But civil operators use QNH there.