We'll If you have a long release and/or a loop you cannot physicaly pull the bow back as far. Sure its only 1/4-1/2 inch but when your talking having the bow fit you right that may make all the difference.
If you can pull your bow back to the back wall.....explain to me how the length of your D-loop affects DL, realisitcally.
What's the difference in finding your D-loop v. finding your string?
I've shot THOUSANDS of shot through several different bows.....and I've never had a D-loop fail (come untied). I suppose one could have the same (unwrranted?) fears RE: limb failure if he so chose.
I've shot a long time and learned the hard way to research before getting the newest gadget no matter how cheap. You have less headaches that way.
Sounds like a resounding reason to take up traditional archery.