They have crappy joystick rubber, that's not debatable. I had to exchange my first DS4 controller recently because of issues I detailed earlier in the topic , and the new replacement one is already starting to peel, which is even more frustrating, since I was hoping a second batch of controllers would have this quirk ironed out.
Also, I work a game testing job , and pretty much all the PS4 controllers I've seen on the company floor have damaged joysticks, so it's definitively more widespread that some might be led to believe. Basically, anyone that plays their PS4 extensively will end up developing these issues after a while... Which is imho unacceptable. My PS3 controller still has rubber on it after ten years of loyal services, same with my DS2 and DS1 controllers. Yet my PS4 controller lasted two months before developing the first symptoms of controller defects.