Oh, man Korean is just too smart. He's like the smartest person in the world! You have hundreds of Chinese engineers working on this project (who more than probably know about the MiG-29 and Su-27) and Korean's just like, "Nope, totally futile. I know more than all of you put together and I can see 20 years into the future with 100% confidence!" LOL
Seriously, I see lots of aerodynamic improvements to this machine. I see it as merging a lot of the airframe designs of the F-22 to complement the faults of the F-35. This, in my opinion, is the F-35 done right. No need for the giant vertical fan in the chest opens up a myriad of improvement opportunities for fuel capacity, weapons bay design, etc... If anything, I think it will serve along the J-20 as successfully as the F-16 alongside the F-15. That's what I think at the moment, but if the PLAN/ PLAAF decides to reject the aircraft for development into a Chinese platform, then I'd be wrong.
Korean, if you're half as much of a hot-shot as you think you are, you should work on the KFX in Korea. If they don't take you, then maybe consider that someone else out there, say, the actual designers of stealth jets, may know better than you. It's a possibility.