So natural immunity is good but you have to risk dying to get it. And you'll note that your quote is saying it's not 100% either. “The immunity provided by vaccine and prior infection are both high but not complete (i.e., not 100%).”
Your link also says "Substantial immunologic evidence and a growing body of epidemiologic evidence indicate that vaccination after infection significantly enhances protection and further reduces risk of reinfection, which lays the foundation for CDC recommendations."
So your own link says that while natural immunity is good - assuming you survive the virus - it is even better if you still get vaccinated.
Natural immunity is acquired by getting infected and surviving. (https://www.hopkinsmedicine.org/health/conditions-and-diseases/coronavirus/covid-natural-immunity-what-you-need-to-know) Of the people who test positive for covid 2% of them die. (https://www.worldometers.info/coronavirus/country/canada/)
So natural immunity is good but you have to risk dying to get it. And you'll note that your quote is saying it's not 100% either. “The immunity provided by vaccine and prior infection are both high but not complete (i.e., not 100%).”
Your link also says "Substantial immunologic evidence and a growing body of epidemiologic evidence indicate that vaccination after infection significantly enhances protection and further reduces risk of reinfection, which lays the foundation for CDC recommendations."
So your own link says that while natural immunity is good - assuming you survive the virus - it is even better if you still get vaccinated.