Well, I don't buy the axles being fixed in place negates the effect. I hope my axles are held in place firmly while traveling down the road. Are you implying "road" vibrations are required to energize or something the beads? I did ride the bike with the beads only in the front tire, no dice, very out of balance. And the rear tire was not fixed in place, that thing was bouncing around so much it was scary, no way would I have tried to run it down the road.
As with all topics, some for, some against.