Microsoft allows updates for older games on the newer systems.Peformance mode feels dynamic on the xsx tbh maybe I’m wrong but the xsx does usually bump bc resolution without patching
Sony makes it so that whatever update that would enhance a game for ps5 would also have to work on ps4 pro.
Performance mode is probably something they couldn't get working on last gen consoles so they couldn't patch it only for ps5 without breaking the game on ps4.
The way sony handles backwards compatibility is stupid as fukk.