Bachus, my piano teacher played with the Baltimore Symphony and she would agree with much of the video you posted. She was an incredible player and played for the Symphony for three decades before passing away. However, she always stressed forearm and wrist movement, primarily when a player was placing emphasis on a particular note or chord.
Gary
Edited by travlin'easy (09/24/18 08:25 AM)
_________________________
PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)