String Loop

[WCB]

Draw-length is Draw-length, the loop does not add to.

Bingo
A loop, or a different release aid, will/can change your anchor point but will not change your draw length. Draw length is God given once you stop growing.
I started using a string loop to keep the arrow from wanting to fall off on let down. I now use a loop release. Scott Silverhorn to be exact... Love it and won't go back to a caliper anytime soon either. But that's just preference...

[Epack]

What's the advantage of a string loop?

its better. PERIOD