Scheffler realizes that as his only point of contact with the golf club, the accuracy with which he applies his hands on the grip has an enormous effect on his ability to control the clubface, and how many of you could say the same?
As a PGA Professional, and based on my experiences in hundreds of Pro-Am competitions over the years, I would say not many. In these events I rarely see any of my amateur partners giving any kind of consideration to their grip at all, let alone checking and re-checking it prior to every shot like Scottie Scheffler. Whereas I see many of them repeatedly rehearsing elaborate swing feels and techniques, very much a case of running before they can walk in my opinion.