It depends on the situation. If you have a skill edge on the field, you make a little bit of money with every hand you play, so playing more hands is benefitial. There are however situations like near the bubble, when you are a short or middle stack, where playing less hands are benefitial, because it increase your chance of cashing. And in those situations using fast fold to see more hands is clearly a bad strategy. These are situations, where on the countrary you might want to take as much time as possible before folding AKA "stalling".