So I once slipped on a puddle while jogging (in the wrong place) and hit the back of my head on sedimentary tiles.
Since I had stiffened my neck, trying to stretch it backward (yes I was doing that while jogging on wet tiles), my head hit the ground hard.
After about 2 minutes, I fainted for ~10 seconds. Was fine later.
That’s the problem with anecdotal evidence. You can always find that one person who fulfills the criteria but who’s outcome doesn’t match.
Of course you can be fine afterwards. But there’s a considerable risk that you’re not, and experiencing symptoms of a traumatic head injury does warrant a visit to the hospital.