8 year old news, synthesized by a reporter that doesn't understand flying...
Garbage article.
This quote, " If during a steep climb the fighters exceed a 20-degree "angle of attack"—the angle created by the wing and the oncoming air—they could become unstable and potentially uncontrollable. To prevent a possible crash, pilots must avoid steeply climbing and other hard maneuvers." shows that the author doesn't actually understand flying, or AOA. AOA isn't a function of climb angle. I can climb straight up (and used to) at very low AOA.
Or this gem; "Fleet pilots agreed it is very difficult to max perform the aircraft" in those circumstances, Defense News quoted the documents as saying." - except that everything I've heard is the opposite. Fleet pilots love the airplane. It's easy to fly.
Look, I've been very open in my criticism of the program for its too-big-to-fail nature and its one-size-fits-all airplane, but this article is pure sensationalism based on outdated information and poor understanding of airplanes.
The airplane is here, it's already in the fleet, and the fixes for these problems have already been implemented.
Why should I care what this clown says?