One of the primary appeals of roleplaying games is their customization. A player can shape her characters and the party as a whole to her specifications, which can support a wide range of gameplay styles.
One player might want a hack-and-slash, action-filled game, and so build characters that are best at dealing and absorbing damage. Another player might prefer a more slow-paced, bag-of-tricks approach, and focus on special abilities like status ailments or techniques that control the flow of battle.
By incorporating this customizability, roleplaying games broaden their appeal. The more variable a play experience is possible in a game, the wider its possible audience.