But if that strategy really works for him, he can still try to use that strategy, but I remind him always to use different strategies to confuse his opponent with your expression.
In addition, we must not forget that the other players also have cards in hand, and they can really have a good game. That's why poker is so unpredictable.
Some of the gamblers skills regarding wtih the cards they know the chance and the probability outcome of their opponent's cards which is a good strategy too some of them make a deep knowledge regarding with the poker like statistics some of the gambler trying to win the game by having the outcome of their card some times having confident on higher scorecards gives them the chance of winning not all wage but still a profit.
In my country when they play casual poker they try to always give them a hint to their enemy about what kind of card they have just shown they will win immediately.