detailFan- Welcome to Autopia!
Clearcoat is just unpigmented paint. If you were to compare a frequently waxed/hand-washed car with one that was not waxed and was run through automatic carwashes (shudder), in a matter of *weeks* you'd see a difference. By the time the lease was up the one taken through carwashes and never waxed would be just dreadful looking, while the one that was properly taken care of would look nearly as good as new.
Those of us who've revived neglected cars know from experience...today's paints are in many ways better, but they still need to be properly cared for, and that includes a sacrificial barrier between the paint and the environmnet (think acid rain and bird droppings, just to name two examples). The sacrificial barrier is what wax is all about, functionally speaking (leaving aside the fact that it makes even a brand new car look better).
Automatic car washes scratch paint up something awful. Even the touchless ones can be trouble. Some things never change, and the need for proper detailing is one of them.