OT: (Regarding the B-2 escorts)
It is unlikely that the B-2 or the future B-21 will be escorted by F-22s. However, they will most likely be escorted by some dedicated jammer like the EA-18G Growler or perhaps a hypothetical enlarged F-35 version of the Growler. B-2/B-21 need a small window to launch their long-range cruise missiles at the DF-21D and DF-26 targets and then turn tails and run for safety. If the B-2/B-21 go all alone without stand-off jamming, their chance of being detected early would only grow. There is also the USN underwater fleet. Their SSN and SSGN can launch cruise missiles without risking the surface fleet.
So if the USAF and USN want to minimize loses, their best bet is to fire loads of cruise missiles from a distance and the safest platforms would be B-2/B-21 with a lot of jamming and SSN/SSGN.
To counter that, you can bet China will continuously increase the ranges of AAMs, SAMs, ASCM/ASBM, build more SSK and SSN and off-course improve aerial and underwater surveillance systems.