this is exactly it, people overlook the planning and coordination piece of this. an operation in which dozens of aircrafts of different types are dispatched will require a lot of background work. the fact that the PLAAF can do this on a regular basis means they are really good at it. This will give them an overwhelming advantage when it comes time to do the real thing since ROCAF does not have the luxury of practicing large scale maneuvers like that. the other piece of this is logistics. the PLAAF has sustained pretty intense incursion campaigns against both Taiwan and Japan for some time, you can do that without good logistics. All of this will make a huge difference in actual combat, more so than what model of airplane they are flying.