Cells like that are supposed to do a quality control check on themselves. One aspect of the aging process is skin cells that are not supposed to kill themselves are doing so, but cells that should be killing themselves because they are damaged irreparably are not killing themselves. You really want to get cells that are too damaged out of the way. You want to get rid of them. Then they'll be replaced by cells that have less damage or no damage.
Skin is a lot more complicated than most people think.
Your skin is not only the biggest and heaviest organ in the body, its complexity is second only to the central nervous system, the brain and spinal cord. A major function of the skin is to maintain the immune system. Ultraviolet light increases the risk of cancer by damaging the skin's immune system. What happens is the skin has less ability for immune surveillance of cells that didn't commit suicide but were supposed to. The skin isn't just something that's sitting there passively between you and the outside world.