A different kind of arm movement

I say “different kind of arm movement” because it’s not the kind of back and forth arm movement that we usually talk about eg the kind used by David Grier and MAB. In the motion I’m referring to, my arm sort of pushes towards and away from the guitar on downstrokes and upstrokes. This is something I subconsciously developed over the years. It’s a similar movement one might use to go from string to string, or perform a wider sweep, but on a smaller scale (Molly Tuttle’s arm does this when she does her crosspicking). It’s almost microscopic when playing on a single string. Does anyone else use this movement? Am I potentially disadvantaging myself by doing this? I’m going to post a video because I feel a video is worth a thousand words in this situation.

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