The death rate for COVID infections in the US has been 0.6%, almost all of which were unvaccinated. 40 million cases is a drastic underestimate; the best estimate of actual cases was 120 million as of July.
I encourage everyone to get vaccinated if they can, but vaccinated people can still infect an entire office by accident. It's possible that vaccinated people might be less contagious on average but we don't have solid data on that yet.