One of the great joys of playing roleplaying games, especially playing a single character through a long campaign, is in seeing your character grow and change. In traditional high fantasy games, it’s fun to rise from humble beginnings to be an important and powerful figure in the campaign world.
However, it’s relatively rare in roleplaying games to see the sort of deep, personal character transformation that you might see in books, TV shows or films. That’s because the sort of growth and change encouraged by traditional roleplaying games is different from the growth and change that most popular media is built on.
Character advancement is not the same thing as character development.