Very good point. From previous readings, I knew that grip strength is directly related to mortality/longevity. I guess a simple explanation/visualization is that the hands are at one extreme from the brain, so if the neuro-signals are already misfiring, then it's just a matter of time before the problems become apparent elsewhere in the body, closer to the brain.

So the jabbed folks having new hand issues now .. is an early warning sign, which I think many other vexed folks had missed before noticing bigger issues seemingly overnight.