Never had a flu shot. Why should I? I had the flu once - 36 years ago & never since. During those 36 years, I worked in places that didn't offer sick leave & people came to work sick because they couldn't afford to lose a day's pay. I also cared for friends who had the flu. Natural Immunity perhaps? I don't mess with something that works.
My sister would get a flu shot every year on the advice of her doctor, who explained, "You must have a flu shot because you're diabetic."
But after getting sick & bedridden for a week after each flu shot, she said, "Screw this; no more flu shots."
You are mistaken about the flu vaccine's "Technology." The reason flu shots don't work is because they have no way of predicting what flu strain will be there each flu season & that makes it "Hit or Miss," & there are many strains, so it's usually "Miss." That's why when there is a really bad flu season, E.R. waiting rooms are filled with people with the flu - who had their flu shot. A few years ago, during a news piece on the flu, a reporter asked an E.R. doctor why that happens. He replied, "Well.....uh.....you see.....we can't predict which flu strain arrives each year."