I think there are two separate questions: 1) will topping add benefit and 2) will topping add to the appearance?
I'd say "yes" to the first and "maybe" to the second.
If the purpose of a coating, wax and sealant is to protect the paint, they all do that to varying degrees. Adding multiple sacrificial layers won't hurt the clear coat and it will probably help in the end. Having said that, the relative thickness of the coating compared to the wax or sealant is like comparing the thickness of the Earth's mantle to the crust. The wax or sealant will benefit you, but probably not that much. Waxing and sealing are easy, so, sure do it. Now, the final layer may not display the awesome hydrophobicity of the coating, so from an action standpoint, topping your coating may decrease visible performance of your coating.
As for appearance, this is always subjective. Can't answer that as many will say it helps and as many will say it adds nothing.
The basic point is that coatings do just fine on their own... Especially opticoat. Topping them will help to a limited extent but may not be worth the effort.
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