Quoted from JonCrox:
People will tell you it's because its 'evened out'. That bugs me because its bs. I get the logic, lots of tiny dents all flattening out over time but then wheres the obvious ridge when the slightly lower dented area (that's flattened out over time) meets the flat no airball area without any dents, like the out lanes? I've got a stern potc, notorious for airballs, with zero dents, craters pooling etc. Guess you and I are just lucky?
I just took in a POTC for esto. Zero dents on the PF even under the revealing light.