Imaro
Legend
1. By studying and learning how.
2. Some arbitrary limit placed by the game system, such as a number of times per day.
3. Because they haven't learned how.
Just like the wizard.
See and to me these are the important questions. You can say the fighter should be able to cut a mountain in half, but until we define the method, limitations, etc. How do I judge whether he should or shouldn't be able to?