It's trending more contagious, but less severe because the vaccines are working. The symptoms are milder because due to antibodies. We were never going to eradicate it just like we never eradicated the 1918 pandemic; we just needed to get to where we are now, having it as a manageable disease.
You might have had it but been asymptomatic.
So funny story: My entire household is vaccinated and boosted. On the other hand, my sister isn't vaccinated and her husband is vaccinated but not boosted, and they have a 3 year old who obviously was too young for the vaccine several months ago. They visit us frequently with their kid because they live nearby and we help take care of him.
We had them over for Christmas 2021, and we find out shortly after they all tested positive for COVID. All of us in my household got tested and they came back negative. We did another test 2 days later to be safe and they were negative. Then my parents did a PCR test and they were negative. Meanwhile, my sister who is unvaccinated had very bad symptoms for like 3 weeks, she had a fever for 10 days straight too. Her husband who had the initial 2 shots was sick, but it wasn't as bad or as long. And their kid who wasn't vaccinated had some nasty flu symptoms for a while.
But in 2020, my brother came over for Christmas with what he thought was a cold, but it turned out he had COVID. He was with us for 2 days in the house, there were like 10 of us. After we found out he had COVID, we all got tests and they came back negative. The remarkable part of this is my dad gave him a 45 minute ride to and from his apartment before and after Christmas, and he didn't catch it from him in the car somehow. So I think it's a combination of some natural immunity, whether it be from genetics or T-cell immunity, and the vaccines.
Also, I had zero side effects from any of the shots. So I wonder if that's an indication existing immunity.