The innovation shouldn't be around stealth and maneuverability, but rather production cost/rate and AI automation. It is really hard to train a fighter pilot, this means you have very few of them, and the one with the best jet wins.
In the new world of AI the jets themselves are trivial, it's the AI that matters and the VOLUME you can produce them at. In this case someone like China is way better positioned -- just steal the IP for the physical airframe (or develop one that is just good enough) then innovate on the assembly line and AI aspects.
The AI fighter jet problem feels much easier than the self driving car problem.