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Great read, thanks for the link. Let me go deeper into this: when I apply either a natural wax or synthetic protectant to a car, it is protected by the product itself. Yes? Adding a coat of Opti-Seal or Zaino CS does what then?
I'm confused about your question. You seem to answer your own question, and then you ask it again.
In general, a sealant and a wax have the same function -- they protect the paint. But, a wax is made from a natural product and a sealant is a "synthetic protectant". There are hybrid products, but in general, a sealant is a synthetic wax.
Here is another article that you might find informative:
Sacrificial Barrier Coating = The purpose of a wax or synthetic paint sealant
Now, if you are asking why some people put a wax over a sealant, it is because they perfer the look of a wax, but want the durability of the sealant. So, the solution is to first use a sealant for long lasting protection, then layer a wax on top of the sealant to get that waxed look.
Does that answer your question?