There isn't much need to worry about NGAD for China in my opinion. Date of entry into service isn't too important, as there will only be a few fighters produced by that point. By then, there will be hundreds of J-20s which will be more than enough to secure air dominance. The main reason why the NGAD is so important for America is not performance, but rather range. They need a fighter like the J-20 with range to actually pursue the offensive missions they imagine.
The F-35 and F-22 are not ideal for the US in Asia. Their range and endurance are totally inadequate for the Pacific theatre.
The F-35 and F-22 are not ideal for the US in Asia. Their range and endurance are totally inadequate for the Pacific theatre.