RE: is there an advantage to using a String Loop?
If you plan on hunting with your bow this season, and you've practiced all sumemr long without a loop, don't add a loop now.
Wait until after this season to try one out.
I've said it many a time, there is no good reason not to shoot with a loop.
Will it save some wear and tear on your string?
You betcha.
Do you absolutely have to shoot with one in order to be accurate?
Nope.