Seems like a lot of trouble to have your lines shackled to the dock, if you wanted to take them with you on the boat. Do you put a wire or zip tie through the shackle pin to keep them from unscrewing open?
Do lines have a problem chafing through where they are tied to a dock cleat? My lines seem to get far more wear where they rub something on the boat.
That's the point; You do not take your mooring lines with you - they are permanently attached to the dock for the season. Yes, the shackles are wired as a requirement (and out of good sense).
If you were to permanently attach lines to a dock cleat or bollard for a whole season, they will definitely chafe. How much? I suppose that depends on movement and how much the line works back and forth.