I've seen some studies saying that hats with gyroscopes are effective, but they focused almost entirely on an exotic output device that worked via sensory subst

I've seen some studies saying that hats with gyroscopes are effective, but they focused almost entirely on an exotic output device that worked via sensory substitution. What am I missing about "hat with gyroscopes and tiny servos that tap you on the side of the head in the direction that's down"? I assume that's the first thing that everyone would try but I haven't heard about it being a common medical device, so there must be something wrong with it. Or is it the "deploy some additional stabilization" step that's missing? Can't think of a realistic way to do that, true. Anything solid enough and deployed quickly enough to be useful would be dangerous. Can't just beef up the cane, you'd have already tried that if it was useful.