Agreed there are some pretty strange things happening around COVID and yes we are all built differently and yes the immune system is not very well understood. But out of that clutter no one can say they are totally immune or that their self perceived immunity gives same level of protection is...
So what happened in early 2021 in the second wave , to me it looks like the memory you talk about did not exist....
If the threat from COVID disappears it will be down to those that have been vaccinated who have reduced the total 'mass' or 'load' of the disease.
The death rate is running at a 1000+ a week and the number is rising and the numbers will continue to rise as we move into winter with the use of more enclosed spaces to socialise. Who knows what the numbers will go to.
Roughly 7000 hospital beds are occupied by people with COVID stopping other...