I interpreted Captmoby's comment as suggesting that tools for getting docklines set were useless because "most docklines stay on the dock" - I believe that a large part of sailing is seeing new places; places where you don't have docklines preset and sometimes where your docking skills are tested. In some cases, some of these tools may help.

Just because a tool is useless to some (who return to their dock every day) doesn't make it useless to others (who sometimes don't).