What doesn't help in general is that there are still many games releasing for last-gen. Compare that to PS360. X360 got Cars: Driven To Win in 2017, 12 years after release.
What are PS4/XBO getting 12 years after release?
- Atomfall
- Call Of Duty
- Kvark (A UE5 half-life clone)
- Splitgate 2
- The Finals (PS4 only)
All kinds of games with far more AA on them than the gen prior had. Diminishing returns and all, PS4/XBO are still interesting enough for a lot of developers to make games for.