How many J-10 A did you produce before moving on to the B & C versions ? Answer that & you'd see what I'm theorising.In my opinion, how do you define foc, J-20 has been produced nearly 300, has become the core of China's air combat aircraft, can't this become foc? Even with the WS10, I think a good example is the F14A, the engine used is the old TF30, the F110 was used later, and the f14a, all the brilliant achievements were done on the TF30 engine. This is very similar to J20
Does that mean all the earlier iterations were bad ? Nope. Far from it. They had limited capabilities unless they were upgraded assuming they had the capacity to be upgraded.
I can't tell whether this method of launch is by design as in whether the development companies & the user which is the PLAAF would've preferred it or is this at the behest of the CMC / CCP for propaganda .
After all totalitarian states are known to indulge in it & have almost turned it into an art form. Like the USSR . They used to initiate projects in great secrecy & then announce it to the world by staging a grand launch . And the CCP has learnt all its lessons from the USSR thoroughly. Too thoroughly I'd argue.