I don't get it either?!
This must be a human error thing.
I only carry knives via pocket clip, and have had a clip sticking out of my pocket 24/7 for many many years....
I have Never even come close to scratching a car with it.
I know I am not doing anything special, however, if I am working on a car then anything that can scratch it (knife/rings/etc) go in my pocket or are put to the side.
Kind of a pretty useless fingerwagging answer. Isn't pretty much every solution a result of human error? Can't figure out how to carry your knife in an efficient manner? Human error if you have to rely on a pocket clip!
This is why they make knives with and without pocket clips, with pocket clips in different shapes and sizes, etc. Even pocket clips that can be removed. It's simply mind blowing how many solutions there exist for knife owners. It's almost as if everyone is different, or something.