Natural immunity has 100% success for healthy people with no side effects.
This is the second time I have seen you say this and it is simply not true. COVID reinfection happens. Shingles is a reinfection or reactivation of varicella. Several strains of hepatitis, after recovering from the acute infection, can continue with chronic infection for life. I could go on.
We don't wear face masks in Europe because they do nothing to protect people, and they increase the possibility of reinfection and extend the period required for recovery.
Emphasis mine. Which is it? Either natural immunity is 100% successful, or you can be reinfected. Can't have both.