Chess manages in practice to be a game of imperfect information, like poker. Obviously it is explicitly a game of perfect information on the board, but the hidden information is all psychological. For instance: "do they actually know this opening/endgame? do they see a tactic? did they take a long time because they calculated that it's a good move, or are they bluffing by making it seem like they calculated something? are they actually better than me or just acting like they are?". etc.
It's true that "bluffing has minimal value against best play", but no human is in that situation. Even super-GMs will play "bluffs" if they are behind (or playing a lower-rated player and sure they can recover later. or just for fun if the stakes are low).
And that's not even mentioning optimal strategy under time pressure. For instance some of the Lichess tournaments are structured such that winning fast is more valuable than winning slowly because the resulting score comes from how many wins you can get in (or in other cases, how big of a streak you can get). So people will play in a way that optimizes for winning quickly by taking big bets / bluffing / creating chaos with un-calculated gambits, especially if they have a good reason to believe they're better than their opponents.
But every serious chess game is a matter of time allocation. The best players in the world are unable to calculate as much as they want in every position: Ultimately there is bluffing and risk taking. See the last game of the last candidates, where both Fabi and Ian have to win to get into a playoff, and they get themselves into extremely complicated positions, where accurate play just takes too long for a human. At an 8 hour time limit, the game is very different than at the time the players actually had, as ultimately Fabi just couldn't calculate to the end on every position he knew was key.
It wasn't the most accurate game of the tournament, but the most instructive as far as the psychology of chess goes
That being said, when Super GMs play a bad move against a lower rated GM, they quite often gets a pass. They don't capitalize, simply because they assume the move is excellent.
