The first time I thought of the functionality of my little fingers was when I was learning card shuffling techniques.
Several years after that, Shoichi Sakurai (mahjong player.) mentioned in his book about the importance of the little finger to draw and discard mahjong tiles.
When I read it, I thought I understood what he meant.
But in reality, I didn't understand it.
Today I read first few pages of a book on coin magic.
The technique introduced is called the classic palm (for a coin.)
I was practicing it during the day at work.
One of my colleague told me that my little finger is obviously unusual.
During the conversation with her, I realized that my little finger is my weakness.
My pinky often stick up in the situations like:
when I drink something out of a cup or a bottle,
when I play piano, when other fingers are working hard.
when I write on a blackboard with chalk
and when I throw a baseball....
My little fingers must be soften, be agile, and be more flexible.