J-10, J-11, J-15, J-16, H-6 have very high operating and maintenance costs. The too much use in Taiwan airspace will reduce its life and strength and can make them repeat the fate of F-16 falling.
If China wants to harass Taiwan, the effective solution is to use J-5 and J-7 aircraft, it's cheap, powerful and easy to produce mass
Of course, J-5 and J-7 are not opponents of F-16 and F-CK, but it's not a problem. Taiwan did not dare to shoot these planes, because it was a war declaration. China can to punish and attack them.