I have 4 kids, and 3 of them got vaccinated for the covid (1 is a baby 2 years old) for the very first time with Delta. They struggle for weeks to recover, they get tired, they seem to have heart related symptoms. Eventually, those went away after months. The baby has never had covid (no vaccine). I then have never covid vaccinated them, and they have never been sick with covid even though my wife and I caught covid after our 3rd vaccine shots. We didn't do any isolation, we share things and direct contacts with them. They might have had Covid but very mild, the quick tests never showed positive.
My wife got blood clot issue that I saw blood coming out from her skin.
I struggled many months with the vaccines with weird fatigues (I'm normally very healthy in my late 30s). My gut biome seemed to change and I became quite sensitive to some food (milk proteins mostly, not just lactose intolerance)
My mom who lived in a different country got 3 shots and she struggled with heart condition for more than a year, Drs couldn't find the reason why. It was difficult for her to do anything with strength. She finally recovered after 1+ year.
There're many real and true stories like mine, I really have no idea what these studies saying anymore.