What are these many games hitting crazy CPU limits?
Theres Baldurs Gate 3 in the late game, Dragons Dogma 2 that is coming out now, Starfield (which isnt on PS5), Gotham Knights (which frankly had many other problems beyond "weak CPU"), and I cant think of much else. Even if some games can drop framerate due to CPU limits on PS5, in most of those scenarios a small uplift would alleviate a lot of the drops and place it at least within VRR window, although most such examples would already even be within the VRR window.
Meanwhile every other day now we are getting a game with a performance mode that has too many asteriks and sacrifices on the image quality side, turning off Ray Tracing, terribly low resolution etc. Those are the issues they are trying to primarily alleviate and the issues that far more games suffer from than "CPU limitations".
Furthermore the documents suggest that sony are pushing developers to target 60fps performance modes on the base PS5, they expect the current situation of performance modes existing on Base console to continue further into the generation, and with that they want to focus on what would be the part most needing of an improvement, and that would be image quality