Do tyre balancing beads actually work?

Every time you stop the balls will fall to the bottom of the tyre, slow down and you get a transition point where the wheel suddenly comes unbalanced. Consider driving a narrow rural road with balanced tyres and you come to a bend where you slow down and the wheels become unbalanced. Maybe not too good on a wet road to have your car do something unexpected.

What about fast driving with fast cornering? Would the balls suddenly exert a force on the tyre side wall?

And the beads wouldn't describe a circle because of the flatish bit of tyre which contacts the road, so they'd have a rapid change of acceleration there. Bugger all idea if that would matter. Then there's the abrasion caused by the beads, likewise.