Texas Hold'em: The flop vs Turn/River
The flop eliminates a majority of reasonable players because they have such a low probability of winning anything. With a dripfed board, they would stay for longer and commit more, thereby being priced in despite having no real chance.

It avoids early big bets by high pocket pairs and (suited) connectors that have caught something from the first single card or the first two community cards, from taking a pot based on the luck of their pocket.

Overall, it turns a game based on luck into one that allows for substantial skill, without eliminating player choice in how to play the game.