I use Easyboot gloves regularly. I don't see the need for studs in the shoe unless you are riding in snow and ice. The gloves do well in water, rocks, mud without studs. I have many friends who use Renegades, none of them have studs.
I have used a bunch of different boots. And the boots that are more rubbery like easyboots grab rock better, but the renegades are by far the best for use.
On summer pack trips I noticed that when crossing big slabs of rock the barefoot horses do good, as well as the ones with boots, however did have some shod horses not only slip but fell down a few times. They just can't go where the renegades can. And the renegades were the non studded ones. Trust me it was getting annoying trying to find trails for some horses when others had freedom to go wherever
Another plus I noticed when riding in the really rocky areas like creek beds was that the back of the renegades protect the heel bulbs too, which ended up being a problem for horses not wearing them they all had swollen ankles while the renegade horses didn't.
As far as wear goes they do wear out faster on rock and asphalt, if you ever did ride on a road with boots just walk because a trot or lope really eats at them fast. Rocks though are nowhere near the wear of asphalt. That being said I have been really suprised at how long they have worn so far. The boots are estimated to give 300-600 miles. I put around three hundred so far and they don't hardly look worn. I expect six or more.
Steel shoes are terrible slippery on granite. Where as aluminum shoes grab hold of granite and hold. Barefoot horses or booted horse are in between those two extremes on granite.
Sand stone on the other hand is just the opposite. Steel shoes bite into the sand stone and shod horses do better than barefoot or booted horses. I've seen friends with traditional shod horses ride across large uphill slabs of sand stone that my bare foot horses could not cross.
Trying to scramble up sidehills of flat sheets of rock, really need the right kind of shoe. I watched my friends cross this sandstone with shod horses and I had to stop and go around with my barefoot gelding
And even though this was pretty flat, the slick rock doesn't offer much traction for the hoof that won't bite into it.
I've ridden some boardwalks that are fine dry, But with a summer rain they become incredably slick until they dry out. Studs would have done wonders on them when wet.