:dblthumb2:
I did a little experiment on my MINI before trading it in. Here is my MINI when Turtle Wax Carnauba Cleaner Wax was topped with Turtle Wax Super Hard Shell.
You are right to a point, almost any consumer wax/sealant will look great when first applied. In fact some will look even better than many boutique brands, NXT for example has amazing POP when first applied. Wait for a rainstorm or two and the look fades super fast. Good waxes and sealants continue to look the same wash after wash, rain after rain.