i think it depends on the game, imo post-game stuff is especially cool in sandbox-y games where there’s many things to do, whereas games that are more linear don’t really need it

but what i hate more than anything is a game that won’t acknowledge you finished it. credits roll, you load your save and you’re back in front of the final boss. i hate that, it makes me feel like the game is in a perpetual state of never being completed. at least put a pretty medal on my save file or something