I think that there are no benefits of not using one’s pinky. If we have four fingers, why not use them? Using the pinky is an excellent way to enhance the skills playing any instrument. I'm studying now the old classical methods for mandolin (Munier, Bickford, etc), the Marilynn Mair's book, August Watters' book, and I found that from the beginning all of them have an intensive use of the pinky. We need the pinky to play in different positions up the neck, even if you want to learn lef hand pizzicato, the pinky is there.
I found too that in my Bowlback is more easy to use the pinky, my A style mandolin has a longer scale and is harder. So I make the same exercises in both mandolins...
In Don Julin's Exercises Book one of the patterns for scales, arpeggios, etc. begins with the pinky. Ted Eschliman's Jazz Mandolin (waiting in my desk) have and intensive use of the pinky(FFcP). However, music is music, with or without the pinky...Django with his two fingers was a master!
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