Good question but a common problem in the plucking hand is about where the fingers swing from. If the right hand technique is correct then the little finger will curl in everytime, it becomes so hard to leave it out.
The hand is designed to work with the joints and transfer loads through them....not over them as a bad technique will do.
In a bad technique a player swings from the 1st knuckle from the wrist, in a good technique a player swings from 2nd knuckle from the wrist.
If you you bend all the fingers from the 1st knuckle the fingertips are all different lengths. So if you swing from this
1st knuckle joint you get a wide longer sweeping arc to the strings and the load go over the joints.
If you bend the fingers from the 2nd knuckle, the fingertips are now all level, the arc is steeper and shorter, and the loads go through the joints.
You will find in the 2nd knuckle technique the fingers not used ( apply this to 1,2,3,4 finger techniques) remain flexed in. The is the natural position for a relaxed hand is to have a slight curl to it, so all we do when in this position is to enhance that flex. In this position you never have the "flicking" little finger because it is being occupied by having to curl.
The subject is a bit more deeper than just these points but these are a few of the main ones.
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