On the point that environmental factors can't be changed by protocols. If obesity makes one more susceptible to Covid will everyone go on a diet and lose however many pounds it takes to lower risk? Same with exercise and nutrition factors, Will people change? I'm skeptical.

The reason Covid isn't going away is because people don't do what's good for them, repeatedly. 40,000 maskless fans at ballgames and you think it's going away? I'm skeptical.

The few who actually follow the Covid prevention protocol, and I prefer Malan's over Coles, may be lucky and avoid Covid, but it's not tested, especially against the more transmissible and more dangerous Covid variants, so it's protection is not guaranteed. For that matter, vaccinated people in Brazil got reinfected with the Brazil variant, and it's in the US now so vaccines are no guarantee either.

Testing works by reducing the R number and the spread, even in a voluntary environment. If those 40k fans are all given Antigen tests and sent home if positive, it's a different ballgame.

For those who say masks don't work, that's not true. A piece of cloth over your mouth doesn't work, but affordable N95 masks do. Use the best rated mask, not junk masks. Better masks keep out nanosize viruses