LEAP-1C is expected to be in market as the main product for 20 years. What nonsense are you talking about? For a commerical airplane, engine is not everything. If you have an ill efficient body plane couple with good engine is useless.
China has intellectual property of C919 body. Then a highly fuel efficient airplane body is useless if cost and maintenance is too high. There is alot of science and commerical operating cost involved in making a truely commercial success passenger airplane and China is not far being. We have the right facilities, industries , fund and talent to compete with best of western.