For copying also one need to have machine to manufacture that level of hardware. Like India intercept the N.Korea ship which carrying High End lathe Machine and missile component to Pak.
Lathe is the used to cut and made material with High Precision for missiles. Even PAk posse the Blue print of missile but it cannot make because it don't have machine to manufacture that kind of material required .
Like wise China do steal the technology through hacking but unable to make fully because they don't have infrastructure to manufacture that kind of technology material.
Only US and Europe uses high Composite material then Indian LCA , while no Chinese planes use high level of composite in making plane. Now the adv of having composite:
A) Longer Life
B) Less time to make
C) less joints/rivets
D) reflect less radar waves
