Lets say that you are new to a world. You started at level 13. Everyone else has been there for since day 1. You've played 3 game sessions. In the third session, you get caught up in this massive war. Lets say that this war splits the group up, forcing everyone to have their own one on one game sessions until they are able to find the others.
However, the DM decides that the easiest way to get everyone back together is to pass the time. He assumes that 3 months go buy, and during these 3 months he assumes the characters gain enough experience to gain 3 levels. Suddenly your no longer level 14 (you leveled the second game session), now your level 17, and your back with the group.
How would you feel? Would this upset you? or excite you?
However, the DM decides that the easiest way to get everyone back together is to pass the time. He assumes that 3 months go buy, and during these 3 months he assumes the characters gain enough experience to gain 3 levels. Suddenly your no longer level 14 (you leveled the second game session), now your level 17, and your back with the group.
How would you feel? Would this upset you? or excite you?