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Now now ladies and gentlemen, what all this "pinky" nonsense? We have an English term for the little finger that isn't American.
When I learned power chords I was already used to playing sevenths, eg 57x6755 and x57x7x, so using index and ring was the obvious choice. Just last year I caught myself using index and pinkie in some situations. I have no idea how or why. My fingers seem to have done it automatically without consulting me.
What’s the pinky one? Is that the little one? I use index and ring finger as they leave the others free for other stuff.