Like so many threads on here, all anecdotal and opinion, no facts.
Yes we have all seen dull lifeless looking paintwork, but you have made the connection with homemade wax without any evidence, we all know that certain era of Vauxhall red was bound to go chalky, this happens to many epoxy and acrylic finishes. And not all metallics have a clear coat finish, thinking of older Volvo greys.
I have owned 8 cars from new, and I read the manuals (because if I didn't, no-one would) and I have never seen it stated not to wax the cars, just the opposite with the manual recommending the OEMs own products and the range generally given its own glass display cabinet in the showroom.
A clear coat is just a resin with no pigment
BTW waxing is coating with a layer of wax, polishing is finely abrading the surface, some "polishes" do both, Mer Ultimate, Autoglym Super Resin Polish and Nanotech for example.
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