IIRC the reviews for the armband were unanimously bad, with the device barely working. If the device wasn't fit for gaming, it definitely would not be fit for any medical or industrial use at the time.
I had the chance to use one at a hackathon, and can confirm the device barely worked. It had huge difficulties differentiating between different input gestures, and the employee who demo'd it admitted as much.
In order to make it reliable you had to make a custom classifier. The one that shipped with their software was garbage.