The RC Powers J-20 design is a heavily modified one from that of the real J-20 design.
The former is a very stable design in favor of manual control-ability at the expense of maneuverability, and without consideration for how draggy and slow it has become since it's just a RC model more for flying fun.
You're living in a fantasy world bro,,,, nobody's gonna build a "scale" true to life model of the J-20,,, its not economically possible?? starting with the FCS alone,,, they can make a model go faster, or slower, but even the Chinese Govt would have a cow trying to replicate the real thing,,,,
and yes I do know they did some scaling and flying those scalings, but they ARE NOT accurate renditions of the J-20 and do not accurately replicate her capabilities even in scale..
Now can you learn something of course you can, and the RC-Powers J-20 is for real awesome, displaying the J-20s supermaneuverability rather than its speed, and that's where the real kool is! sorry Bub, but scale flying aircraft, all have to have help,,, the larger the size, the easier they fly without Gyro stability enhancement.