All paint wears and dulls over time. My Scooby's door handle (driver) inside area is worn out. My hands have literally rubbed the silver away, revealing the plastic on the handle. Paint will chip near edges. You have to be really careful when you wash your car. Don't use a high pressure spray. Gently clean it. Do not for one moment think you can use any kind of abrasive such as "Color-cut" to bring up the color. It will only create discoloration and swirls if you're not careful. Some times the only way to get a great paint job is to spend $5K and get it done right.
Dulls and oxidizes over time yes, wears......not so much. I am not sure what "Color-cut" is that you mention, but I can guarantee that other professional abrasive polishes will not create discoloration. Any abrasive product can create swirls, spider webbing, marring, etc if you do not know how to use/apply the product properly. The vast majority of the time, you do not need a new paint job to bring back your paint to a show room finish. Most times, all you need is a professional detail.
