if the sling is made properly - the missile should never hit the release cord.
I do wear out release cords.
But in my case it's more down to the whipcrack effect.
I use three knots at the end of the relese cord. This allows me to vary my grip width and knots also give a really secure hold.
I've tried a bunch of jaegoors slings, including a long distance one that had a flat leather tab.
I found it really difficult, because it was a long sling with a decent rock - the stress on a flat tab means you have to grip it really tight.
Which messed up my release.
Jaegoor has farmers hands - more industrial power tools than human appendages.
Don't get into a grip contest with him lol
So probably has no problem maintaining that kind of pressure.
He also had one with a toggle that went between your fingers and one with a bead on the end.
The bead wasn't too bad but the toggle system just did not work well.
My slings are specifically designed so that the release cord gets out of the way before the missile leaves the pouch.
Something you can do with paracord that is difficult with the short, stiff braided slings.
But my cords wear out just below the bottom knot. It's NOT where I grip.
It's just where the cord whips at the end of it's travel.
I think when we did the slinging road trip - I wore out two cords in the two days.
It's another reason i make modular slings and always carry enough cord and a lighter to make another in a few minutes.