Russians are setting up the Su-57 as optionally-manned, the Americans have strong sensor fusion in the F-35, etc.
Not exactly ahead of the curve here, but reasonable as a set-up.
To some extent, 6th generation seems closer to a 5.5th generation, given that it's mostly an exaggeration of 5th gen capabilities.
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Also, I'll point out that the most important factor is roughly the same I've been arguing for regarding the J-20; i.e, stealth aircraft require a larger payload capacity, especially since the F-35, having roughly the same payload capacity as a J-20, has set a new bar for stealth aircraft payloads.
The most important thing is that this is a basic modification possible to the J-20; i.e, a J-20 that's only moderately modified can achieve many 6th generation specs (improved stealth, improved payload) as long as the WS-15 is around to carry all the weight.