What are the benefits of a baitrunner reel?
A baitrunner reel allows you to regulate the drag between the drag at the start and the drag required during combat. You can move between one and the other very quickly with the first crank turn.
You are therefore able to anticipate by regulating the drag rate for combat before the carp sets off. However, the baitrunner reel combined with the front drag increases the overall weight of your reel.