What? Are you 13?
Yes, let's build more of an aircraft that has a 45% mission capable rate and after 5 years since reaching IOC, still doesn't have a complete A-to-G capablilty. Orbiting at 60K, chucking AMRAAMs at 3rd Gen targets from BVR is one thing, but it's a much different story when the opponent gets in close and can match or outperform your 5th Gen techno-wonder. Getting off the ground and to the fight is the first priority.
The Chinese have taken a very interesting approach to their new jet. As was said it's huge. This leads me to think of it less as a fighter, but more of a long range interceptor, like a MiG-31. The nose is large enough to hold a decent sized phased array radar. Just not sure on how well the Chinese have mastered the ability to build powerful, but compact systems. That could have driven the size also.
-S