An idea that's been knocking around my head past few days, especially after that 5 tracker video. There needs to be some kind of glove interface. But it doesn't have to be expensive, not yet anyway. Just enough to track the bend of your fingers. And sceptics don't like full gloves, it can be off-putting.Then I recalled a fitting form factor...
I know, "lol'', right? But you can see exactly where the STEM and battery would go, right? And for those not familiar, the Power Glove wasn't a full glove, it was a half-glove you strapped on top, with an open feel to the bottom.
The original Power Glove used a trick involving Electrical Resistance to measure four different finger bend strengths per digit. It might be even simpler nowadays, like a linear sensor running along the finger length, but I'm certainly no electrical engineer, so I can't say for certain.
I just think it would be a good design basis for a cheap, functional finger-tracking glove, that would be less likely to scare people off.