I hold my pencil "wrong" and I wish someone would have worked with me when I was little to correct it. I have tire out easily and have some arthritis in my middle finger due to my grip. I definitely watch how my kids are holding their pencils. You don't know when you are 7 years old how it will affect you later.

I'm a repentant (but not reformed) thumb tucker.

Source: https://theanonymousot.com/2013/03/22/when-to-fix-a-pencil-grasp/