Not sure where you are getting your data, but this does not match what I am hearing from epidemiologists.
The vaccines are only so so at preventing infection with current strains. They are pretty good at preventing severe outcomes, but even that protection wanes over time. A lot of the newer strains seeming to be milder is because of the protection that vaccines do give, but that protection is far from foolproof.
I have not seen data that long covid is much less common. They are still trying to figure out long covid, and it is still very unpredictable in course, symptoms, duration, and who it hits. I have heard long covid is less common in the vaccinated, but it still happens to the vaccinated. And long covid can mean a long slow recovery, or it can mean new drastic symptoms that don't go away, like severe exercise intolerance, shortness of breath, etc, that may not have even been part of that person's symptoms when they were first stick.
I'm glad your more recent infection was like a walk in the park. Unfortunately there is no guarantee your next round (whenever that may be, with whatever strain might be around then) will also be easy. We don't know how the next strains will affect people, and they may be more severe, or different in other ways.