This is actually a huge issue with the DS4 affecting a lot of DS4s. People on this thread are up in arms about an actual issue.
The top of the stick in the first picture is all scratched up. I can't think of why that would happen naturally. Maybe the person's thumb nail but I don't see how that would occur with normal play. Does the thread explain that?
Regardless, this is why I don't buy launch systems. If there is a problem, it should be fixed by the time I'm ready to make a purchase.