Ok, hopefully I can explain this properly. just say you set your drag to your fishing reel (not attached to rod) at 5kgs and you tested via a set of scales and it was spot on five kg before line started coming off the reel (not taking into account stiction). Then say you attached a rod to the reel and threaded the line through the guides. The drag was kept the same. You then tested again with the rod pretty much loaded up as it was a 3-6kg rated rod. Would the drag increase significantly before line started coming off the reel because of the rod? I would expect there would be only be a very slight increase in drag due to friction but not much especially using braid. So generally no, no significant increase in drag. Am I wrong?