My understanding is that most virologists believe we will end up in an endemic situation so that is what is going to happen in the long run (the crux is how we get there).
> natural immunity to more antigen sites than just the spike protean
Current studies show that natural immunity does not seem to be superior to immunity from the mRNA vaccines (for immunologically naive persons) - so heuristically speaking it seems to be better to 'train' antibodies on one thing rather than several antigen sites at the same time (this may seem counter-intuitive at first but is in line with many other infectious diseases).
However, once you have been vaccinated (or resp. have recovered from Covid-19) exposition to the virus (or resp. to the mRNA vaccines) will have additional benefits as you suggested!
> natural immunity to more antigen sites than just the spike protean
Current studies show that natural immunity does not seem to be superior to immunity from the mRNA vaccines (for immunologically naive persons) - so heuristically speaking it seems to be better to 'train' antibodies on one thing rather than several antigen sites at the same time (this may seem counter-intuitive at first but is in line with many other infectious diseases).
However, once you have been vaccinated (or resp. have recovered from Covid-19) exposition to the virus (or resp. to the mRNA vaccines) will have additional benefits as you suggested!