The speculation about the driver team moving on from Alchemist certainly has evidence piling up in support. A770 is not doing well in Nvidia showcase games or all but one of the Sony ports tested. Ratchet and Clank was the only brightspot really. I guess it should not be surprising that both Intel and AMD struggle with games optimized for Nvidia. The RT wins over Radeon are phyricc victories.
When I was actively gaming on the A750 there were constant improvements in older games, but DXVK was almost always superior. New games played well bang for buck wise. I dubbed it fine blueberry wine. Judging by this update the bottle is "corked" now.

It's a cautionary tale perhaps. In that there is no knowing if optimizations for B series will continue when series C approaches release.
Spiderman still has the asset streaming issue with a 7500F, a CPU that makes sense to pair with an inexpensive GPU. Especially given ice shops AliExpress. XeSS was broken in one game. Bummer.