So I've been watching a lot of videos about handlining, tenkara, and pole fishing for carp. I have always operated under the impression that the purpose of the reel drag was to not only take stress off the line and tire out the fish, but to eliminate the danger of tearing the hook out of a carps soft mouth. However these systems are not present on tenkara or poles. So is the drag for protection of the fish's delicate mouth or is it just to help not break lighter lines? Thanks!