Well, it is if you enable it. If he's saying that the "enable" option is clicking the quest marker, then that would be similar to the LCB. However, I don't think many people will enjoy seeing the boundary constantly during the quest. And if it's a game option, those people will disable it and still end up failing quests once in a while. Having 30 seconds to turn around and go back if you forget, or making it so Fetch doesn't require staying inside the boundary (the better option, I think) would solve the problem without making it always visible.