Grip strength is a quick way to evaluate how much full body strength one possesses. If you have the hand strength of a 12-year-old, you aren’t picking up heavy things.
Most of the world’s knowledge of the kettlebell is limited to the swing and perhaps the Turkish get up. Both are fabulous exercises, but the kettlebell is not limited to those two movements. Many of the people I work with have tremendous grip strength, and much of that is due to how I program our kettlebell exercises.