When you have to put a line around a bollard or docking ring there is a great potential for it to “Saw” back and forth and chafe through the line in quite a short timeframe.
Wrapping the line around the bollard or ring will prevent this sawing and prevent the chafe.
A word of caution though, if you are going to wrap at the bollard end, make sure you do not have the line adjustment at that end. i.e. wrap and tie back to the boats cleat with a cleat hitch or wrap and bowline, but tied back to the boats cleat with a cleat hitch.
This ensures that there is no way force can “roll” your wrap around the bollard or ring and its a straight pull.