We had dinner the other night with a guy who works in the ICU, very interesting to talk to him.
Basically - 2020 was very scary, people were coming in with no real way to treat them. People came in and ended up on ventilators all the time for the flu and usually they pulled through, but with COVID, pretty much anyone who ended up on a ventilator was a 100% mortality rate.
I asked him how many cases like that he sees now - he said zero. There are people in the ICU who have COVID, but it's coincidental to their primary symptom, unlike in 2020 where COVID was primary. He said that most people would think this is because we've all had it or been vaccinates - which is a contributor for sure - but mostly the virus has mutated to less deadly strains. Less deadly strains transmit better because they don't kill the host and have more time to spread, which does produce that aforementioned immune response.