That was sort of my thought too, but nowhere in nature would our brains be exposed to vibration over long periods of time, and I know that concussions that don’t meet the clinical definition lead to brain damage.
I couldn’t really find much on the impacts on the brain of vibration specifically, but I have seen experiments where vibration was added to a semi-solid, and it liquified because the weak “cell wall” analogues dissolved. I know that’s a totally different mechanism, but it got me curious :)