Originally Posted by TennisCJC
Yes, I agree. Arm, especially forearm and hand, adds control and feel.
I use/think the word passive to indicate that the legs and core should be used more. It is more common to see players with too much arm and too little body. So, visualizing a passive arm with more emphasis on the leg and core helps these players. I also like to use "passive" about wrist and forearm movement just before, during and just after contact. I don't think you want to consciously monkey with your wrist/hand position other than to direct the ball where you want it to go.
But, all in all, OP is correct.
Exactamundo - the idea can be a helpful cue for a player with a "top heavy" swing that uses too little drive from the legs and core. Sometimes this image can help with finding those stronger engines for a good stroke, but I figured it out when I tried working out for several weeks with a "training racquet" that was really heavy and also rather dead. Fifteen or twenty minutes of arming the ball was exhausting until I tapped my kinetic chain and got more passive in my arm.