Letting out the traveler lets the line out faster, there is a 1:1 ratio. If you have an 6:1 on your main sheet then letting out 6 feet of line lets out the boom out 1 foot. So releasing the traveler gives a more rapid release of the boom.
True, but it's a gross vs. fine move. Plus, ya gotta haul it back in at 1:1 and those H16 travelers have never been very smooth.
