Chicoms aint going to have their whole J-20 fleet combat ready and deployed to the eastern front. There's only so many airbases chicoms can use for an attack on Taiwan and those bases are well within range of Taiwan cruise missiles.
F-35's, F-22's, F-18E's, F-16V/AESA, F-15E/Apg82 all go to war in a network centric warfare system that includes Naval warships, ISR aircraft and SATs. US will own the whole EM spectrum giving them superior battle space picture. Current F-35's are more than capable of taking on J-20s. The Apg-81is still the most advanced AESA that is on any fighter with capabilities that no other fighter AESA has. People in here for some reason have decided to crown the J-20s a$$ with capabilities they pulled out of their a$$es. J-20 is the chicoms first "stealth fighter" and they are not going to publicize any issue it has unlike the F-35 program.
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Wanna address/continue a bit a conflict with the chicoms...
US has been training for this kind of war and this is where training with close allies pays off bigtime because they get to use their ECM and EW to full effect against each other where chicoms have no allies to train this way. When chicoms train with Russians it is heavily scripted and they never use their EM energy for obvious reasons.
Chicoms are still at least a decade away from being able to fight in a combine arms/Joint command style warfare and their first bigboy war will be against a modern military like Taiwan, US, Japan and Australia... Good luck with that.