Yes, that's where this model is massively missing, an accomplished pianist plays with the whole arm, the elbow is crucial, it needs to stay very relaxed in order to accommodate the peculiarities of the human hand, the ring fingers and little fingers don't have as many tendons connecting and having a little sway in the elbows is crucial to making those fingers deliver the weight of the arm properly to the keybed. This model appears to ignore rotation of the wrist, and easing the elbows, where at a bare minimum it needs to start at the shoulder, and I'd argue the whole body.