Games that support a higher native resolution like 4K might benefit from improve anti-aliasing through supersampling down to 1440p. Notably, variable refresh rate on the PS5 only works at 1080p and 4K; 1440p resolution is not supported.
https://www.techspot.com/news/95455-ps5-beta-system-update-adds-1440p-support-gamelists.html?utm_source=dlvr.it&utm_medium=blogger
https://www.techspot.com/news/95455-ps5-beta-system-update-adds-1440p-support-gamelists.html?utm_source=dlvr.it&utm_medium=blogger