Wow, I'll take rope shredding granite and schist anyday over doing that.

I bet these were mostly caused by toproping rather than wet ropes. I've seen grooves like this on lots of desert climbs, mostly 1 pitch climbs. We need to be mindful of rap placements and be willing to belay at he top to avoid this type of destruction whenever possible.

Rob, there's really not a climb here. Behunin is a very popular canyoneering descent in Zion, so, those grooves are caused by rope pull after a rappel is all. Wet or dry ropes would do that, IMHO.
Really hard to prevent on low angle rappels such as this.

it'll cause alien geologists alot of trouble in another few thousand years... either way, its nothing to get worked up about imo, prettier to look at than bolt and piton scars!

It's kinda cool.