Agreed.
After you've got to the Polish stage, you can go in two different directions...
A) Sealant application and then a Wax Application
or
B) Ceramic Coat and then Reload. With Plan B) you don't have to wax or re-wax
Plan A) might last 20,000Km without being in full sun. Plan B) might last 50,000Km
The way you wash and dry your car after a wash, and what products you use are important as well + a 2 bucket system.