no no no my unimaginative friends, it's the neural stimulation industry, prepare yourselves , we have got something to stimulate everyones nerve's, all of them, all of the time

This feels like what typically happens when new areas of medicine or treatments are discovered. Suddenly everyone wants to use it in unproven areas, and market it to desperate people with a poor prognosis, or poorly understood/treated conditions.

I have POTS, a form of dysautonomia, and have been given some exercises that stimulate the vagus nerve that do appear to assist during acute episodes, but not long term. A handful of conditions will probably be found where it can help, and the rest will end up being placebo or “snake oil salesperson” type behaviour.