The responses in this thread remind me of all the mongs that would complain about tanks chain pulling in leveling dungeons and them complaining about not getting time to "enjoy the dungeon"
Cool, didn't know about the black part, but tbh it's probably faster to just pull it all to 2nd boss and skip the swim.
Saving a few seconds after having to spend a minute or two corralling cats isn't saving time. As many have said, since you can literally run from one boss to the next while dragging mobs along, you are not saving any time (or, if you do, the time saved is extremely negligible). Plus people get the fun of nuking a deathball of mobs down, which everyone loves.