If you are referring his defeat at the end against the dragon, that is because of his hubris. He was too proud and believed that he could do it alone without his soldiers. This brings his defeat and he realizes that he will die because of his hubris, after which Wyglaf will take over since he was the only one brave enough to help.
Advantage is that you could basically do whatever you would like to, you also wouldn’t have to pick up anyone’s trash.
Disadvantage is that you would be alone, you would get bored of the same old books and movies.
