I think we're talking about three mechanisms here, not two:
1) motion of wrist
2) rotation of forearm
3) bending of elbow.
A lot of people say "wrist" when they mean some combination of wrist and forearm. And "don't move the arm" usually means "don't bend the elbow."
August W
Exploring Classical Mandolin (Berklee Press, 2015)
Progressive Melodies for Mandocello (KDP, 2019) (2nd ed. 2022)
New Solos for Classical Mandolin (Hal Leonard Press, 2020)
2021 guest artist, mandocello: Classical Mandolin Society of America
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